If you haven't been tracking, the UK authority in charge of fining people for saying things that the UK doesn't like attempted to fine 4chan last year #1258926

This resulted in some wonderful and exciting missives authored by 4chan's layer, Preston Bryne. Yesterday, the Ofcom head Karen, Dame Melanie Dawes, said that Ofcom probably wouldn't be able to collect fines levied on foreign entities.

Bryne referenced an obiter dicta in a dismissal of a suit 4chan brought against Ofcom in US courts in September of this year:

Finally, at the risk of gilding the lily, to the extent any foreign judgment against Plaintiffs [4chan] were penal in nature, Plaintiffs may find a receptive audience before American courts regardless of the judgment’s compatibility with the United States Constitution. That is because American courts are not necessarily required to enforce foreign penal judgments

The judge seems to have gone out of their way to make the point that US courts are not obligated to enforce UK law.