I mean perhaps, I don't know what lm28469 mentions, perhaps I can test it but I feel like those LLM generated videos would be some days/months old.
If I ask a prompt right now and the video's say 1-4 months old, then the conspiracy theory falls short.
Unless.. Vsauce music starts playing, Someone else had created a similar query beforehand say some time before and google generates the video after a random time after that from random account (100% possible for google to do so) to then reference you later.
Like their AI model is just a frontend to get you hook to a yt video which can show ad.
Hm...
Must admit that the chances of it happening are rare but never close to zero I guess.
Fun conspiracy theory xD