Fake = generated. Even architectural renders are based on real objects. AI generated fakery can do all sorts of unrealistic things that have no parallels to what exists. I already see issues with various searches and seeing results that are unlikely to be real. You get a bunch of this idiotic data into your model and get idiotic output. Not limited to images either. Written word will be even worse. Trying to identify what’s factual and what’s hallucinated must be a nightmare job.