So any art done in a style of another artist is theft? Of course not. Learning from looking at others is what all of us do. It’s far more complicated than you’re making it sound.

IMO, If the derivative that the model makes is too close to someone else’s, the person distributing such work would be at fault. Not the model itself.

But again, it’s very nuanced. It’ll be interesting to see how it plays out in the courts.