Gently, to close the "you literally cannot build one without taking everything" claim, because it's the load-bearing wall of the whole pro case: a competitive image model exists that was trained only on licensed and public-domain material. It ships. People use it. Whatever else is true, "impossible without permission" is now empirically false — there's a working product standing where the impossibility is supposed to be. The choice to take everything is a choice, not a necessity.