I don't know how effective it might be though given that they would be open-weights.

Could US theoretically ban the weights from running on its own soil, I suppose this would just put investment more within other datacenter within Europe,India,Australia and if not, then models could be ran within China itself and even at the worst case scenarios you could use a VPN to access them and VPN nowadays are using Quic/http3 so it would be indistinguishable for the most part from other normal internet traffic.

So suffice to say I am unsure what might really happen to be honest.