i suspect they want to get paid for all the art works that have gone into training the ai...i think there should be a hefty tax on any AI generated content because it's impossible to credit all the people who had a hand in it.
I can’t give a great painting example, but in the world of music, should The Beatles get a cut from every single band they influenced, which is basically all of them.
It seems like of artists went down this road the AI developers could come up with a pretty strong defense.