AI does not make a game slop. It’s the human that releases a slop game. And there are plenty of human made slop games too. It’s just that the slop game creators can make a lot of these with ai in a short time. Itch is self publishing which means that there is no publisher that would block low effort slop. In theory the quality guidelines would deny indexing for slop. But distinguishing an amateur game from professional slop ain’t easy.
You are going to to lose that culture war. In ten years, using “slop” as anything other than a derogatory term for AI output is going to be like using “gay” in its previous sense of “happy” instead of “homosexual”. Oh, the word will still be applied to human works, but the subtext is going to be “you are less than human for creating something this bad”.