I mean, if the whole thing is that the filter makes you sound like Drake, you are objectively using Drake’s likeness for commercial benefit without his permission.

IANAL, but that’s about as straightforward of a copyright violation as it gets. Doesn’t matter if it’s AI or not.

But as far as generative AI? That’s a way more interesting question. If I train a GAN to create original new songs, is it “sampling” songs in its training data, or is it “learning” from them and then transforming that information into something new? I would say the latter, but I’m sure the RIAA disagrees.