I think a lot of the discussion is where the balance of the creativity lies when a human uses a model (trained on other artistic works) to create art.

Is the result a copy, or perhaps a derivative work of the art in the training set?

Does the person using the model have authorship of the result?

Was it even okay to use the art to train the model and then share the resulting weights?

Are the resultant weights protected by copyright themselves?

I suspect the actual answers we'll come to on these topics will be full of nuance.