How I found out: I made a comment on reddit on a very niche topic for which no google hit or and thus no AI overview existed. To my surprise the next day when searching for my own reddit post, google would happily copy my reddit reply almost verbatim into the AI "overview" box, linking no other post but mine. And my reply was also the only google hit.

Asking AI for learning / explaining purposes is absolutely fine in my book - but I have absolutely no motivation to set up AI to solve challenges. Without AI you can't really compete successfully. So AI is really taking motivation away for me which in turn again prevents me from learning more. I am not sure that this is solvable.