There is a distinct difference between "AI trained with a million pictures of anime boobs creates anime boobs" and "AI trained with thousands of pictures of mickey mouse creates mickey mouse." Copy from one, it's plagiarism; copy from two, it's research. Just as if you hire an artist to create anime boobs you can sell the result (assuming you bought the rights and all that) but you can't hire an artist to create mickey mouse and sell it. I'm fairly sure "Mickey Mouse" was in the prompt somewhere. Makes me wonder what you get for "Cartoon Mouse." Of course I'm not saying Mickey Mouse shouldn't be in the public domain by now because my goodness.

I did a quick test and at least for the version of stable diffusion I used "Cartoon Mouse" creates the most generic cartoon mouse possible and "Mickey Mouse" creates Mickey fucking Mouse. So I'm gonna say this is a nothing burger argument at least for now.