Y Combinator Urges White House to Support Europe's Digital Markets Act

Figure 1: Visual representation of the BeyondTrust vulnerability chain

On Wednesday, March 13, 2025, Y Combinator published a letter addressed to the Trump Administration calling for American support of the Digital Markets Act, according to TechCrunch. The letter was sent amid ongoing discussions between the United States and European Union regarding technology regulation and trade policy.

The timing coincides with the European Commission's continued enforcement of the DMA against designated gatekeepers. As of March 2025, the Commission had opened multiple investigations into potential DMA violations by major technology platforms.

Y Combinator's letter argues that the DMA's requirements for interoperability and data portability benefit smaller companies attempting to compete with established platforms. The accelerator contends that American startups stand to gain from regulations that prevent dominant platforms from leveraging their market position to disadvantage competitors.

Y Combinator's central argument holds that the Digital Markets Act serves American economic interests by creating market access for startups. According to the letter, dominant platforms have historically used their control over app stores, search rankings, and advertising systems to disadvantage smaller competitors.

The European Commission's official documentation states that the DMA requires gatekeepers to allow third-party app stores on their platforms, enable users to uninstall pre-installed applications, and provide interoperability with messaging services. The regulation also prohibits gatekeepers from ranking their own products and services more favorably than those of competitors.

According to the European Commission, the DMA is enforced jointly by the Directorate-General for Competition and the Directorate-General for Communications Networks, Content and Technology. The Commission serves as the sole enforcer of the regulation.

Figure 2: How the authentication bypass vulnerability works

The Digital Markets Act creates several potential advantages for technology startups:

Interoperability requirements could allow smaller messaging applications to communicate with dominant platforms like WhatsApp and iMessage. App developers could distribute software through alternative app stores, potentially avoiding the 15-30% commission fees charged by Apple and Google.

Data portability provisions enable users to transfer their information between services, reducing switching costs that historically favored incumbent platforms. Search and advertising transparency requirements could create opportunities for specialized competitors.

Y Combinator's portfolio companies, many of which compete directly with products offered by designated gatekeepers, could benefit from reduced barriers to market entry in the European Union.

Critics of the Digital Markets Act argue that the regulation imposes compliance costs that disproportionately burden American technology companies. The designated gatekeepers are predominantly American firms, while European competitors face fewer restrictions.

Security researchers have raised concerns that requirements for third-party app stores and sideloading could increase malware distribution. Apple has argued that its App Store review process protects users from malicious software.

The regulation's geographic scope limits its direct impact to the European market. American consumers would not automatically benefit from DMA-mandated changes unless companies choose to implement them globally.

Some technology executives have argued that interoperability requirements could compromise user privacy by forcing platforms to share data with competitors. The technical implementation of cross-platform messaging, in particular, raises questions about end-to-end encryption standards.

Figure 3: Privilege escalation from user to SYSTEM level

The Digital Markets Act establishes a framework for identifying and regulating "gatekeepers" in digital markets. A company qualifies as a gatekeeper if it provides a core platform service in at least three EU member states, has significant impact on the internal market, and serves as an important gateway for business users to reach end users.

Core platform services covered by the DMA include online intermediation services, search engines, social networking, video sharing platforms, messaging services, operating systems, web browsers, virtual assistants, cloud computing services, and online advertising.

Once designated, gatekeepers must comply with a series of obligations within six months. The obligations include allowing users to uninstall pre-installed apps, enabling third-party app stores, providing data portability tools, and refraining from self-preferencing in search results.

The European Commission can impose fines of up to 10% of a company's global annual turnover for violations, increasing to 20% for repeat offenses. In cases of systematic non-compliance, the Commission can impose structural remedies including divestiture.

Technical context: The DMA's interoperability requirements for messaging services present significant technical challenges. End-to-end encrypted platforms must develop protocols for secure communication with external services while maintaining encryption standards. The European Commission has acknowledged that implementation timelines for messaging interoperability extend beyond other DMA obligations.

Y Combinator's public support for the Digital Markets Act signals a potential shift in Silicon Valley's relationship with antitrust regulation. Historically, the venture capital community has opposed regulatory intervention, arguing that market forces adequately discipline anti-competitive behavior.

The letter suggests that some investors now view dominant platforms as obstacles to startup success rather than potential acquirers or partners. The argument that regulation benefits American startups inverts the traditional framing of the DMA as an attack on American technology companies.

The intervention also reflects ongoing tensions between large technology platforms and the startup ecosystem. Y Combinator's portfolio companies frequently compete with products offered by Google, Amazon, Apple, and Meta. The accelerator's support for the DMA aligns its regulatory preferences with its economic interests.

European regulators have welcomed American support for the DMA framework. The regulation has faced criticism from the U.S. government under previous administrations, which characterized it as discriminatory against American companies.

Several questions remain unanswered following Y Combinator's letter:

The Trump Administration has not publicly responded to the letter. The administration's position on the Digital Markets Act remains undefined as of March 13, 2025.

Y Combinator has not disclosed which specific DMA provisions it considers most beneficial for startups. The letter's full text has not been made publicly available.

The extent to which other American venture capital firms share Y Combinator's position is unknown. No other major accelerators or venture funds have publicly endorsed the DMA.

Whether Y Combinator's advocacy will influence American trade policy toward the European Union remains to be seen. The United States and EU are engaged in ongoing negotiations regarding technology regulation and data transfers.

The European Commission's ongoing enforcement actions against designated gatekeepers will provide evidence of the DMA's practical impact. Investigations into Apple's App Store policies and Google's search practices are expected to produce decisions in 2025.

The Trump Administration's response to Y Combinator's letter, if any, will signal the direction of American policy toward European technology regulation.

Implementation of messaging interoperability requirements, scheduled for later in 2025, will test the technical feasibility of the DMA's most ambitious provisions.

Quarterly earnings reports from designated gatekeepers may reveal the financial impact of DMA compliance costs and any changes to business practices in the European market.

The Hacker News discussion of Y Combinator's letter, which received 504 points as of March 13, 2025, indicates significant interest in the technology community regarding the intersection of startup economics and antitrust regulation.