[1] https://www.courtlistener.com/docket/71209929/1/4chan-commun...
4chan does not reach out to UK users in any way, only responds to their incoming requests.
It really is analogous to UK users going to a foreign country, buying something that their home country has an issue with, having a third party ship it to their home country, and then their home country getting mad at the store.
NZ agreed to cooperate with the US request. That made all the difference. If the US agrees to allow UK to proceed, then that's trouble for 4chan.
How exactly do they do that? Do they have peering agreements with UK-based ISPs?
They don't bring their services to the UK, ISPs and other network operators do - the UK can go after those and force them to implement the Great Firewall of Britain but that would be less popular so they don't yet.
> The US does the same thing: Kim Dotcom comes to mind.
Quod licet Iovi, non licet bovi. The UK can try to go after US citizens abroad if they want to but they will quickly find out why that's a bad idea.