AI generators use and merge pre-existing images, they can never in the near future learn to paint something on their own without relying on scraped databases of images and photos made by humans, scraped and used without said artists consent.
On one hand, Cory is right: when you get a number of art pieces from an artist and try to emulate their style by copying and arranging - maybe in order to improve your own artistic skills, maybe merely to have a picture of your latest character - I'd guess you don't ask permission either.
Furthermore, style has never been protected. Products are. Intellectual property is, to an extent. But it would be almost impossible to protect style.
There is a bit of an issue when you try to turn a profit from the sale of derivative work, but since style is not protected, it's more a moral issue than a legal one.
No on the other hand, I don't like where this is going. Because derivative work (of any kind - physical, technical, artistic, social...) has the capability to supplant a very large portion of the workforce. I would have no issue with it if we globally had a society where redistribution was a thing, but we don't. Being barred from gainful employment because there is someone, somewhere, that can do the same for one tenth of the wages is bad enough. But being barred from gainful employment because what you are doing is, not obsolete (it is still valuable since it is still in demand), but brought down to the initial cost of acquisition. AIs and robots are the ideal slaves: you buy them once, and then they have a marginal upkeep cost until you decide to upgrade. As long as we, as a society, don't have a solution for all those who will be put out of work, and merely shrug them off by saying "they can just find another job", we will have a major social problem with AI.
And I'm pretty much convinced that those who push for AI-in-the-workplace have no intention to find such a solution.
So, yes, I can see the appeal of being able to get derivative art of a certain style for basically nothing. I can also see the huge problem we are collectively building up.
It's interesting to notice that even the dystopian writers of the cyberpunk movement had not considered the consequences of AI and mobile robotics. Most people in cyberpunk settings are poor, yes, but they still have jobs. But when you truly consider how those jobs could exist - if the wages are lower than the cost of the autonomous machine over time -, you realise that threshold is quite low, and probably not sufficient to provide subsistence for someone.
In the end, social peace will be either bought (welfare) or enforced (dictatorship). And I'm not optimistic about what the people in charge will end up choosing.