We can see a clear timeline of art and it’s progression throughout human history, and it’s often clear how a later work took inspiration from an earlier period.
Art school teaches techniques and methods pioneered by earlier artists, for the express purpose of their students to know how to incorporate them into their own original work.
Yet, no one is arguing that Van Gogh’s descendants should be paid a small royalty anytime a variation of on of his painting is produced, or even just when a painting in the style of one of his is produced.
Were all visual artwork to disappear from the world and collective human memory today, then the first new pieces produced by artists would look dramatically different - and likely much worse - than they do today.
What AI is doing is no different. Perhaps faster and on a larger scale than how humans learn from one another, but principally it’s the same.