Cryptography, DeCSS ... we have a long history of trying to block things like this and it simply not working.

There is a long, convoluted set of legal arguments that are going to make the weights of a model "facts", rather than "code" making it even harder to "ban". Furthermore having them not be "facts" is going to open up a whole other legal argument about what they are and what the attribution is.

I suspect that they are fishing for a case, so a judge can set some precedent.

You're going about this backwards. They don't have to ban models. They ban the consolidation of compute without a license. This will be far easier and already has legal precedent.