When a human learns, they carry that forward into their future ventures. They might use their learning to recreate the original work and profit from it without attribution. In the West we view that badly and have legislation to protect from some abuses. But the same person might later collaborate with the original author, or make a derrivaive work that improves on the original (a la most science).

AIs automate the copying (and to some degree the derrivation mode too). They do it 1000s of times a day. The capital owners who provide this as a service are doing one of these two: - either claiming the IP isn’t valuable in the first place and charging only for the machinery they’re providing - or claiming the fees they charge contribute to the costs incurred with acquiring training data, but not sharing that with the training data creators in a royalties/licence-like manner (so, I’m sayung they’re devaluing the source material but not to zero, and resisting reasonable profit share or collaboration)