I agree that images only through AI should be removed from art sites.
The issue with AI art is that the only human contribution in those pieces is the creation of the prompt and the curation of the final image. Without sensory and experiential inputs of its own, AI can only interpolate between real images and styles. So an AI generated image doesn't add much artistic value since its not expressing any new deep truth or factual understanding of the real world.
Well isn't all art just a derivative of another piece? The issue with that statement is that art is fundamentally a communication from a human artist to a human viewer. At the level of AI prompt creation and curation, you act more like an art gallery owner rather than an artist, which doesn't communicate artistic values in the same way as does an original piece derived from the experiences, history, and skill of a human artist.
Dall-E 2, Stable Diffusion, should be used for inspiration and helping with minor elements of a piece, but someone passing off an AI generated image as part of their portfolio is disingenuous at best