It's not "wrong", I never said they were not subject to UK law.
My point was that there is not a single thing UK politicians can do to have US companies "shut down", or even force compliance here, because US companies care not a jot for UK law due to being completely outwith it's jurisdiction.
If they choose to comply, that is fine and well, but there is literally not one thing the UK can do to force it, never mind the ridiculous notion of somehow compelling them to "shut down".
You are rebutting a claim I never made.
Do you realise that right now 4Chan are in a legal battle with OffCom over exactly this? Offcom have continually badgered 4Chan about their non-compliance, including continual escalating fines, and 4Chan have completely ignored Offcom because they know that there is not a single thing Offcom can actually do to force compliance or force 4Chan to pay fines, because 4chan is not subject to Offcom jurisdiction and the US courts will simply laugh Offcom out of the building due to the absence of any US law than mirrors the relevant UK legislation.
So I ask again, how, precisely, do you propose the UK lawmakers "shut down" US companies?
You might as well be politely asking North Korea to hold free and democratic elections simply because that's what we do in the UK. They'd just laugh at you the same way 4chan are laughing at Offcom's futility and the absurdity of trying to force compliance on an entity which is entirely out of your jurisdiction.