Whether or not its creating something "new" is debatable, but its clearly not copy pasting. It is basing the artwork on a combination of other sources, nothing is created de novo, but that is very different than copy & pasting

> Stable Diffusion is literally copy-pasting existing artwork. It's not creating anything new.

Do you have a source for that? Somehow I doubt there would be this much interest in a tool that literally just copies existing artwork.

The training set for human artists is the entirety of human art that they have been exposed to in their lifetime, even accidentally.