There are good arguments for the copyright infringement belonging to the user, not the model maker, in this thread.

One issue with that is that there is not a reliable way to determine if copyright is being infringed.

Even if models could be used responsibly, there might not be a reasonable expectation that most people will. If infringement is so easy and avoiding it relatively hard.

I'm not sure what legal prescriptions should be made on this basis, but it's an interesting thought.