Ofcom has claimed it has “sovereign immunity” as it seeks to fend off a US free speech lawsuit from the website 4chan. Lawyers for the regulator told a US court that there were “substantial grounds” for throwing out the lawsuit. 4chan, a notorious online message board, has sued Ofcom in the US, claiming that the regulator’s enforcement of the Online Safety Act contravenes American laws, including the First Amendment, which protects free speech. It comes after Ofcom investigated the company under the Act and fined the company £20,000, which it has refused to pay. In a notice filed to a...