Earlier quoted context omitted.
Not prohibit training, but make it illegal for US companies to embed, use or distribute LLMs created by China. Basically the general consumer will need to go through the effort of use the LLM that they want, which we know means only a small fraction of people.
Making something illegal isn't gonna work if there's clearly value in doing it, and isn't actually harmful. Regulatory unfairness is easily discerned. Look at how competitive chinese EVs are, and no amount of tarriffs are gonna stop them from dominating the market - even if americans prevent their own market from being dominated, all of their allies will not be able to stop their own.
LLMs will become the ultimate propaganda tool (if they aren't already), and I don't see why governments wouldn't want to have full control over them.