I'll note that there can be multiple main critiques coming from an incoherent set of viewpoints, since this is public opinion we're talking about.

Between "AI doing creative work", if you believe, and "fraud", there's all the low-key filler material that's sub-creative and sub-fraudulent. There's a similarity between the phrase it was made with AI and phrases like I didn't bake your cake myself, it came from a store or sorry, it's just a cheap plastic one. So part of AI's image is that it's a flourishing new source of disappointment.