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.
