How would it even be stopped if you could ban it? It's not like you're banning just one company. Anyone with the resources can still obtain and run the models. Sure, big models like Kimi K3 will be less accessible until a foreign version of Openrouter with no incentive to listen to US law begins offering it. Or they offer it and obfuscate what model it actually is behind codenames.

It wouldn't surprise me if that kind of problem is partially why weights are open. Because you can't meaningfully stomp them out completely.