US court dismisses 4chan lawsuit against UK regulator Ofcom

This ruling clarifies that U.S. streaming and social platforms cannot use domestic courts to block foreign regulatory investigations before they reach the enforcement stage. By upholding sovereign immunity for Ofcom, the court reinforces that digital services with significant international user bases must navigate the specific legal frameworks of the territories where they operate. For the broader streaming ecosystem, this signals that compliance with the UK Online Safety Act is a mandatory operational cost that cannot be bypassed through First Amendment claims in U.S. district courts. Industry observers should watch for whether Ofcom attempts to seize U.S. assets to satisfy future fines, which would trigger a secondary legal battle over the domestic enforceability of foreign penal judgments.

Ofcom has been steadily building its enforcement apparatus since the Online Safety Act received Royal Assent in October 2023. In May 2025, Ofcom published its first set of illegal content codes of practice requiring platforms to conduct risk assessments and implement safety measures, establishing the regulatory baseline that platforms like 4chan and Kiwi Farms must now meet. The regulator has signaled it will prioritize services posing the highest risk to children, with enforcement powers that include fines of up to 10 percent of global annual revenue or £18 million, whichever is greater. This framework positions the dismissal of the U.S. lawsuit as a critical jurisdictional test of whether platforms can resist Ofcom's reach from outside the UK legal system. The business implications for platforms operating internationally are significant. Ofcom designated 22 platforms as Category 1 services in late 2025, subjecting them to the strictest duties under the Act, including requirements to protect users from legal but harmful content and to provide greater transparency around algorithmic recommendations. For platforms that refuse to engage with the UK regulatory process entirely, as 4chan and Kiwi Farms have attempted, the ruling confirms that non-compliance carries escalating financial risk. Ofcom has indicated it will pursue enforcement against non-compliant services regardless of where they are incorporated, and the FSIA dismissal removes the option of using U.S. courts as a shield against that process. The technical and legal context around cross-border content regulation is tightening globally, creating a compliance landscape that streaming and social platforms must navigate simultaneously. The European Union's Digital Services Act entered full enforcement in February 2024, requiring very large online platforms to conduct systemic risk assessments and submit to European Commission oversight, establishing a parallel regulatory regime with its own penalty structure of up to 6 percent of global turnover. Australia's eSafety Commissioner issued its first compliance notices under the Online Safety Act amendments in 2025, targeting platforms that failed to remove class 1C material within required timeframes. These parallel enforcement actions demonstrate that the jurisdictional question resolved in the 4chan case is not unique to the UK. Platforms operating across multiple territories face an expanding web of national content regulations, each with its own enforcement mechanism and penalty regime, making the FSIA dismissal a template for how sovereign immunity doctrines may protect foreign regulators from preemptive legal challenges in U.S. courts. Meanwhile, Meta Online Safety Act appeal continues to test the limits of Ofcom's authority regarding global revenue fines. As these tensions rise, US lawmakers introduce Granite Act to further challenge the regulator's reach.