> I presume such US legislation isn't going to try claim worldwide jurisdiction to block all persons worldwide from using Chinese models. In which case, the French guy wouldn't be violating American law.

legislation will block importing Chinese models to the US

> As for the American company, it's pretty difficult to check the provedance of open weights.

government or some companies can build benchmarks/system which will give y/n answer

But it will claim worlwide juridistcion , just as all interpreations of the law are in Washington nowadays. Its how a commercial deal between A Chines company(Huawei) and an Iranian telco ends up with Canada reying to rendition a executive for violating US laws. The goal is to spread as much FUD as needed to dissuade anyone form using the Open models and herding them back to the propreity ones.