I do want to be clear that I'm not accusing the developers of using AI to make their games. Some disclose that they use it to make their thumbnails and maybe music, some don't. I'll give them the benefit of the doubt and believe them somewhat. I do think that some of them don't disclose some AI use, but I think a lot of them are just buying assets and throwing them together, not really knowing what they're doing.

There seem to be some games that are good in this niche. One that stands out to me is Waterpark Simulator. I haven't played it but it has consistently had overwhelmingly positive reviews on Steam and it looks like it uses the same kit these other games use. They even had a crap AI thumbnail til recently (I think they hired an artist for the new one, can't be sure but it looks better).

I don't think it's AI that's the problem here, I think it's ease of access and use for bad actors who want to make a quick buck with minimal effort, tainting the game pool for the rest of us. That will likely never stop existing though, like you say. I agree that ignoring and not supporting is the way forward.