People here seem to be thinking this a UK/Europe-specific phenomenon, but there's plenty of examples of the US "seizing" sites that were never hosted in the USA either, and even put pressure on countries to extradite people involved even if they never broke any laws in the country they're living in.
One I remember was a site hosting streams of the 2022 football world cup. Or a number of Iranian-affiliated news sites just last year. Or offshore gambling websites in 2021.
People going "Those Crazy Brits! Thank God That'll Never Happen Here!" seem pretty ill-informed.
USA doesn't block websites. The FBI will seize domains after some judicial review and a court order. That's about it.
I think people here are also more fond of 4chan than the average citizen, and also in general rather fond of technological freedom of anything. Makes sense, being players basically in the team about to get a red card. Like it or not, the global internet became a convenient way to skirt local laws and I don't see any reason why exempting something in one place only because it originated in some other place. Is now enforcing a law "the CCP way"? Should internet be kept lawless only because... internet?
I am hardy a fan of these processes but they are not "extraterritorial" in the same way, since the registrars were generally US-based.