Competition Law and Digital Rulemaking Ecosystems and Antitrust

1. Introduction

Digital rulemaking ecosystems refer to digital environments in which a platform, operating-system provider, app store, marketplace, payment network, cloud provider, standards body, or other technological intermediary establishes the rules under which other businesses must operate.

Examples include:

• app-store developer rules;
• search-ranking and indexing rules;
• marketplace seller standards;
• API-access rules;
• interoperability specifications;
• payment and billing requirements;
• content and advertising rules;
• data-access and portability conditions;
• technical standards;
• cloud interoperability requirements;
• certification and verification systems; and
• algorithmic rules governing visibility, ranking or access.

The competition-law issue arises because a firm can simultaneously be a market participant and a private rulemaker. Its rules may therefore determine the competitive conditions faced by its own rivals.

Traditional antitrust law generally examines agreements, exclusionary conduct, tying, refusal to deal, discrimination and monopolisation. Digital markets add a further question:

Can a dominant digital intermediary use its rulemaking power to design the competitive environment in which its rivals must compete?

This is particularly important where the rulemaker controls an essential gateway to users, data, infrastructure, interoperability or transactions.

The EU's Digital Markets Act illustrates the shift toward ex ante regulation. It supplements, rather than replaces, traditional EU competition law and imposes specified obligations on designated gatekeepers.

2. Meaning of a Digital Rulemaking Ecosystem

A digital rulemaking ecosystem normally contains five elements:

A. Rulemaker

A platform or infrastructure provider establishes the rules.

Examples:

• mobile operating-system provider;
• app store;
• online marketplace;
• search engine;
• cloud provider;
• payment platform.

B. Participants

Other businesses must comply with those rules to obtain access to consumers.

These may include:

• app developers;
• merchants;
• advertisers;
• content providers;
• competing services;
• sellers;
• payment providers.

C. Gateway

The rulemaker controls an important route to the market.

The gateway may be:

• an app store;
• search engine;
• API;
• operating system;
• payment system;
• cloud infrastructure;
• ranking mechanism.

D. Rules

Rules may concern:

• access;
• ranking;
• fees;
• commissions;
• interoperability;
• data;
• payment methods;
• advertising;
• technical certification;
• security;
• dispute resolution.

E. Competitive consequences

The rules can influence:

• entry;
• expansion;
• innovation;
• switching;
• multi-homing;
• prices;
• quality;
• consumer choice.

3. Why Digital Rulemaking Creates Antitrust Risks

3.1 Rulemaking and market participation are combined

A conventional regulator normally does not compete with the firms it regulates.

A dominant platform may do exactly that.

For example, an app-store operator can:

1. establish rules for developers;
2. enforce those rules;
3. collect fees from developers; and
4. operate competing applications.

This creates a potential regulator-participant conflict.

3.2 Rules can become exclusionary instruments

A rule may appear neutral but nevertheless disadvantage competing businesses.

Examples include:

• prohibiting alternative payment systems;
• restricting interoperability;
• limiting API access;
• imposing discriminatory ranking criteria;
• requiring use of the platform's own services;
• preventing external links;
• imposing technical requirements that rivals cannot economically satisfy.

The legal analysis should therefore examine substance and competitive effects rather than merely the formal wording of the rule.

4. Principal Competition-Law Issues

A. Abuse of dominance

Where the rulemaker has substantial market power, rules may constitute abusive conduct under provisions such as Article 102 TFEU or national equivalents.

Potential theories include:

• exclusionary conduct;
• discriminatory access;
• tying;
• leveraging;
• self-preferencing;
• refusal to interoperate;
• unfair trading conditions.

B. Foreclosure

A platform can potentially foreclose rivals by making access to its ecosystem:

• technically difficult;
• commercially unattractive;
• excessively expensive;
• slower;
• less visible;
• dependent upon approval.

Foreclosure does not necessarily require an express prohibition. Technical architecture itself can function as a competitive rule.

C. Self-preferencing

A platform may establish ranking or recommendation rules that advantage its own products.

For example:

Platform controls ranking → platform competes with sellers → platform designs ranking rules → platform's products receive preferential treatment.

This creates a classic conflict between rulemaking authority and competitive neutrality.

The European Commission has continued to address self-preferencing and related platform rules under the DMA; in July 2026 it announced findings of non-compliance concerning Google's treatment of its own services in search and restrictions concerning alternative purchase channels on Google Play.

D. Interoperability discrimination

Digital ecosystems often depend upon APIs and technical interfaces.

A dominant firm may provide:

• complete access to itself;
• limited access to competitors;
• delayed access to competitors; or
• technically inferior access to competitors.

This is particularly significant in:

• AI;
• cloud computing;
• messaging;
• mobile operating systems;
• payments;
• connected devices.

In 2026, the European Commission used the DMA's interoperability framework to require Google to provide competing AI services with effective access to relevant Android capabilities.

5. Digital Rulemaking and Standard Setting

Digital rulemaking has important parallels with traditional private standard-setting.

A technical standard can determine which products can participate in a market.

For example:

Standard → certification → interoperability → market access.

If competing firms collectively establish a standard that excludes another technology, antitrust concerns may arise.

The U.S. Supreme Court's standard-setting cases are therefore highly relevant to modern digital ecosystems.

6. Important Case Laws

1. Allied Tube & Conduit Corp. v. Indian Head, Inc., 486 U.S. 492 (1988)

Facts

Allied Tube participated in a private standard-setting organisation responsible for the National Electrical Code.

The standard-setting process affected whether competing electrical conduit products could obtain market acceptance.

Allied Tube and its allies sought to influence the process in a manner that excluded a competing product.

Decision

The U.S. Supreme Court held that participation in a private standard-setting process could attract antitrust scrutiny.

Merely complying with the association's formal procedures did not immunise conduct where the process itself was manipulated.

The Court emphasised the importance of safeguards against economically interested participants biasing standard-setting.

Digital significance

The principle is directly relevant to:

• technical standards;
• API standards;
• interoperability protocols;
• digital certification;
• industry-led platform rules.

Lesson: formal compliance with an ecosystem's procedural rules does not necessarily eliminate antitrust concerns.

2. American Society of Mechanical Engineers v. Hydrolevel Corp., 456 U.S. 556 (1982)

Facts

ASME operated a widely recognised technical standard-setting system.

An ASME committee chair gave an interpretation of the ASME Boiler and Pressure Vessel Code that affected Hydrolevel's competitive position.

Decision

The Supreme Court held that the standard-setting organisation could be liable for anticompetitive conduct of its agent acting with apparent authority.

The Court recognised that standard-setting organisations can significantly affect competitive opportunities and therefore must exercise appropriate institutional safeguards.

Digital significance

Modern platforms similarly rely upon:

• trust-and-safety committees;
• technical certification;
• API approval;
• developer-review teams;
• ecosystem governance bodies.

Where those mechanisms affect market access, governance design becomes a competition-law issue.

3. Radiant Burners, Inc. v. Peoples Gas Light & Coke Co., 364 U.S. 656 (1961)

Facts

A gas burner manufacturer alleged that an industry association's approval system was being used to exclude its product.

The approval process allegedly lacked objective standards and resulted in competing products being denied access to the market.

Decision

The Supreme Court allowed the antitrust claim to proceed.

The case demonstrates how industry certification or approval mechanisms can become instruments for excluding competitors.

Digital significance

The modern equivalents can include:

• platform certification;
• "approved developer" programmes;
• marketplace verification;
• security certification;
• app approval;
• interoperability certification.

A platform's certification rule becomes particularly sensitive when obtaining certification is practically necessary to reach consumers.

4. FTC v. Qualcomm Inc.

Facts

Qualcomm occupied important positions in cellular chipsets and held standard-essential patents.

The FTC alleged that Qualcomm used licensing practices and its position in the cellular technology ecosystem to disadvantage competitors.

The case involved the relationship between industry standards, intellectual property, licensing and market power.

Decision

The Ninth Circuit ultimately rejected the FTC's principal Sherman Act theory, including the asserted antitrust duty to license Qualcomm's SEPs to rival chip manufacturers.

Digital significance

The case demonstrates that:

• participation in standards does not automatically create antitrust liability;
• standard-essential technology and antitrust obligations must be carefully distinguished;
• an obligation arising from a standard-setting commitment is not necessarily identical to an antitrust duty to deal.

This is important for digital ecosystems involving:

• 5G;
• IoT;
• connected vehicles;
• cloud standards;
• AI interoperability;
• smart-device ecosystems.

5. Google Android – Google LLC and Alphabet Inc. v. European Commission, Case T-604/18

Facts

The European Commission examined Google's Android ecosystem, including relationships among:

• Android;
• Google Search;
• Chrome;
• Google Play;
• device manufacturers;
• mobile network operators.

The case concerned product bundling, exclusivity payments and anti-fragmentation obligations.

Decision

The General Court examined Google's conduct as part of a broader ecosystem and upheld the essential finding of an infringement of Article 102 TFEU, although it adjusted aspects of the Commission's reasoning and fine.

Digital rulemaking significance

Android illustrates how ecosystem architecture can produce competition effects across connected markets.

A rule governing one layer can influence another:

Operating system → app distribution → search → browser → advertising/data.

Therefore, competition authorities may need to examine the ecosystem rather than treating every digital product as an isolated market.

6. Apple – App Store Practices (Music Streaming), Case AT.40437

Facts

The European Commission examined Apple's App Store rules governing music-streaming applications.

The investigation focused particularly on Apple's anti-steering provisions, which restricted developers' ability to inform users about alternative purchasing arrangements.

The Commission considered the App Store an important gateway between developers and iOS users.

Decision

In March 2024, the Commission found that Apple's anti-steering provisions infringed Article 102 TFEU and imposed a substantial fine.

Digital rulemaking significance

This is a particularly clear example of platform rules becoming competition rules.

The issue was not merely Apple's price or product.

It concerned a rule determining:

What information developers could communicate to consumers inside the platform ecosystem.

This demonstrates that digital rulemaking can affect competition by controlling the flow of information as well as physical or technical access.

7. Additional Important Authority: Google Shopping

The Google Shopping litigation is also relevant to digital rulemaking because ranking rules can determine which businesses receive visibility.

The legal issue concerned Google's treatment of its comparison-shopping service within general search results and the alleged preferential treatment of its own service.

The litigation demonstrates that algorithmic ranking can become a competition-law instrument when a dominant platform controls access to consumer attention.

The broader principle is:

Search-ranking rules can function economically like access rules.

8. Traditional Standard Setting vs Digital Rulemaking

The common antitrust concern is private control over a rule that materially determines competitive access.

9. Rulemaking as a Form of Market Power

Digital rulemaking can create several forms of power.

9.1 Access power

The platform determines who can enter the ecosystem.

9.2 Ranking power

The platform determines who is visible.

9.3 Data power

The platform determines who receives commercially important data.

9.4 Interoperability power

The platform determines which technologies can communicate.

9.5 Payment power

The platform determines which payment systems may be used.

9.6 Governance power

The platform determines which conduct is permissible within the ecosystem.

This last category is increasingly important because governance itself can become an economic bottleneck.

10. The "Rulemaker–Competitor" Conflict

The most important structural problem can be represented as follows:

Dominant Platform

↓

Creates Ecosystem Rules

↓

Rivals Must Comply

↓

Platform Also Competes With Those Rivals

↓

Potential Conflict of Interest

↓

Foreclosure / Discrimination / Self-Preferencing / Exclusion

↓

Antitrust or Digital-Market Regulation

The problem becomes particularly acute where there is no realistic alternative route to consumers.

11. Rulemaking and Essential Facilities

Some digital infrastructures may raise issues analogous to the essential-facilities doctrine.

Potential examples include:

• dominant app distribution infrastructure;
• critical interoperability interfaces;
• essential data interfaces;
• dominant cloud infrastructure;
• payment rails;
• communications infrastructure.

However, dominance alone does not automatically create an obligation to provide access.

Courts generally distinguish between:

1. legitimate product design;
2. ordinary commercial refusal;
3. exclusionary refusal;
4. discriminatory access;
5. conduct that satisfies the stringent conditions for a duty to deal.

Therefore, a digital platform cannot be treated as a regulator merely because it is technologically important.

12. Algorithmic Rulemaking

A particularly modern problem is that rules may no longer be expressed in ordinary text.

They can be embedded in algorithms.

Examples:

• search-ranking algorithms;
• marketplace recommendation systems;
• ad-auction algorithms;
• seller-ranking algorithms;
• automated fraud systems;
• app-review systems;
• dynamic pricing systems.

Consequently:

Code can perform the economic function of a rulebook.

Antitrust analysis may therefore have to examine:

• ranking variables;
• default settings;
• API permissions;
• data inputs;
• model objectives;
• exclusion criteria;
• recommendation systems;
• algorithmic changes.

13. Procedural Fairness in Digital Rulemaking

Competition law may increasingly focus not merely on the substance of rules but also on how ecosystem rules are created and enforced.

Important safeguards include:

Transparency

Participants should understand material requirements.

Non-discrimination

Comparable businesses should not receive unjustified differential treatment.

Objective criteria

Rules should have legitimate and verifiable technical or commercial justifications.

Due process

Businesses should have mechanisms to challenge wrongful exclusion.

Consistency

Rules should not selectively change when they affect competitors.

Independent review

Highly consequential decisions may require meaningful internal or external review.

These concepts are particularly relevant where private governance performs quasi-regulatory functions.

14. Digital Markets Act and Rulemaking

The EU DMA represents a significant development because it addresses certain ecosystem problems without requiring authorities to prove every element of a traditional abuse case.

Among other requirements, Article 6(7) addresses interoperability for designated operating systems.

In 2026, the Commission specified measures requiring Google to provide competing AI services with effective interoperability with relevant Android capabilities.

The Commission also pursued data-access measures concerning Google's search data under Article 6(11).

This illustrates a transition from:

"Did the dominant firm unlawfully exclude competitors?"

toward a complementary regulatory question:

"What rules must a gatekeeper follow to preserve contestability?"

15. Competition Concerns Across Digital Ecosystems

App stores

Potential concerns:

• mandatory payment systems;
• anti-steering;
• discriminatory review;
• app exclusion;
• commission structures.

Search engines

Potential concerns:

• self-preferencing;
• ranking discrimination;
• data advantages;
• preferential treatment.

Marketplaces

Potential concerns:

• own-brand preference;
• seller ranking;
• access to transaction data;
• discriminatory commissions.

Cloud ecosystems

Potential concerns:

• switching barriers;
• interoperability restrictions;
• data portability;
• technical lock-in.

AI ecosystems

Potential concerns:

• API access;
• model interoperability;
• data access;
• operating-system integration;
• preferential treatment of proprietary AI.

Digital advertising

Potential concerns:

• auction rules;
• access to advertiser/publisher data;
• self-preferencing;
• discriminatory interoperability.

16. Defences and Legitimate Justifications

Not every ecosystem rule is anticompetitive.

A platform may legitimately impose rules relating to:

• cybersecurity;
• privacy;
• consumer protection;
• fraud prevention;
• technical reliability;
• intellectual-property protection;
• data protection;
• system integrity.

For example, interoperability restrictions may sometimes be justified where unrestricted access creates genuine security or privacy risks.

The critical question is whether the restriction is:

1. genuinely necessary;
2. objectively justified;
3. proportionate;
4. applied consistently; and
5. not being used as a pretext for exclusion.

The 2026 EU Android interoperability measures expressly contemplate security and data-protection considerations when determining appropriate access arrangements.

17. Remedies

Competition authorities may employ several remedies.

Structural remedies

• separation of business units;
• divestiture;
• removal of conflicting ownership interests.

Behavioural remedies

• non-discrimination;
• interoperability;
• access obligations;
• prohibition of self-preferencing;
• transparency requirements.

Technical remedies

• APIs;
• data portability;
• interoperability interfaces;
• access protocols;
• algorithmic transparency.

Governance remedies

• independent compliance monitors;
• appeal mechanisms;
• neutral certification;
• audit procedures;
• independent technical committees.

The choice of remedy depends heavily on whether the problem arises from ownership, conduct, architecture or governance.

18. A Useful Legal Test

For examination or research purposes, digital rulemaking can be analysed through the following framework:

Step 1 – Identify the rulemaker

Who establishes the rules?

Step 2 – Identify the gateway

What resource does the rulemaker control?

Step 3 – Define the relevant market

Which product, service, user group and geographic market are affected?

Step 4 – Establish market power

Does the rulemaker possess dominance, gatekeeper status or substantial market power?

Step 5 – Identify the rule

What precisely does the rule require or prohibit?

Step 6 – Identify the affected competitors

Which businesses must comply?

Step 7 – Examine competitive effects

Does the rule:

• foreclose rivals?
• increase switching costs?
• reduce interoperability?
• distort ranking?
• disadvantage competitors?
• restrict innovation?

Step 8 – Examine justification

Is there a legitimate technical, security, privacy or consumer-protection rationale?

Step 9 – Apply proportionality

Could the objective be achieved through a less restrictive method?

Step 10 – Determine remedy

Consider:

• access;
• interoperability;
• non-discrimination;
• transparency;
• portability;
• structural separation.

19. Six Core Cases — Quick Revision Table

The standard-setting cases establish the foundational principle that private rulemaking can have competitive consequences, while the modern digital cases show how the same concept operates through platforms, operating systems, app stores, rankings and ecosystem architecture.

20. Conclusion

Digital rulemaking ecosystems represent a convergence of platform governance and market power. A dominant digital firm may no longer merely sell a product; it may establish the rules governing how thousands of other businesses reach consumers.

Competition law therefore needs to examine not only traditional questions of price and market share but also:

• who writes the rules;
• who controls access;
• who receives interoperability;
• who receives data;
• who receives ranking preference;
• who can challenge exclusion; and
• whether the rulemaker competes with the businesses it regulates.

The central legal principle emerging from the standard-setting and digital-platform cases is that rulemaking power becomes a competition concern when private rules materially determine market access and are capable of being used to disadvantage actual or potential rivals.

Modern digital regulation, particularly the EU DMA, increasingly complements traditional antitrust by directly addressing interoperability, steering, data access and other ecosystem rules. The 2026 Android interoperability proceedings demonstrate how this approach is moving from general principles toward detailed technical specification of the conditions under which digital competitors must be allowed to operate.