The issue is that A.I. always does a certain amount of mistakes when outputting something. It may even be the tiniest, most insignificant mistake. But if it internalizes it, it'll make another mistake including the one it internalized. So on and so forth.

Also this is more with scraping in mind. So like, the A.I. goes on the internet, scrapes other A.I. images because there's a lot of them now, and becomes worse.