Oddly that's Zuck doing that. And weirdly, the law would only apply to app stores. I think that's a separate movement from what the UK is doing though. That US law is designed to hamstring Meta's competition not restrict political speech but it can be abused the same way I think.
There is no "US law" there are 45+ pending or passed pieces of state legislation, along with the federal Kids Online Safety Act (KOSA) that's yet to be passed.
The PACs that push the one specific law you're talking about also push laws in other states, and federally, that are very, very different and draconian.
If only it were isolated to the UK. I know a website that does not hold content itself but rather links to other sites. Basically exactly what google does.
And yet, me sitting in Germany suddenly saw a nice banned notice when trying to access the site claiming this is because of "a high court verdict yadayadaya".
Why on earth do I now find ways around a UK court order to unblock a website when I am nowhere near their country? They should at least try and keep things within their jurisdiction.
It is amazing that these guys don't see the irony of monkeying totaliterian states policies, in term of surveillance and censorship.