The models (ie the weights specifically) may not be copyrightable, anyways. There's no copyright on the result of number crunching. Once the model is further fine-tuned, there might be copyright, but it's still unlike anything covered by copyright in the past.

One analogy I have is a 3D engine. The engineers design the look of the typical output by setting parameters, but that does not create a specific copyright on the parameters. There's copyright on the design documents, the code, the UI, if any and maybe other stuff. It's not quite the same, though.

Some jurisdictions have IP on databases. I think that would cover AI models. If I am right, then that means that any license agreements that come with models are ineffective in the US.

However, to copy these models, you first need to get your hands on them. They are still trade secrets, so don't on leaks.