To play devil's advocate here, it seems like I keep hearing people saying to avoid games/etc over AI content, and the actual AI content is really minor things that no one would have ever paid attention to.

I suspect as it continues to become more common, people will care less. But in the meantime admitting to even minor AI use for background assets/etc is enough to get you a bunch of negative reviews on Steam (judging from my discovery queue).

There was also how Arc Raiders got a terrible review from Eurogamer because of some disclosed AI voice lines.