Any argument about regulation in the US which doesn't mention that China and other countries aren't bound by that regulation should be heavily questioned. Exactly who are you stopping from doing what you don't like?!? Law abiding US citizens won't be able to run them, but you didn't solve anything other than making sure US citizens pay Sam or Dario.
I rather let citizens of my country exercise our own authority and agency when deciding what is necessary for good societal outcomes (LLMs aren't necessary).