I started noticing that for a lot of niche questions, AI overview often uses things like Reddit comments as the source, which are often partially or completely wrong.
If only! I've seen it sourcing reddit comments, but when you follow the link, the comment is either completely unrelated or does not say what the LLM claims it is saying.
I don't know what causes this to happen, but I've noticed it too and it distinctly feels like source laundering. How often do people actually verify that the sources say what the AI claims? Probably vanishingly rare, right? Everyone else gets the impression that the claims have actual sources of some kind.