All mentioned models were trained on a large batch of works taken from Internet - no one is going to argue that.
All of those models cannot exists without content created by people.
The models allow to mimic the styles of particular artists making it a perfect tool to kill creativity and artists diversity in the long term.
It is a tool that allows radical combinations of concepts and styles, I'd say it empowers combinatorial exploration. And the combinatorial space is very sparsely explored.