I'm going to do a half step back and you can blast me you want. But take those individual parts of what you're asking about and ask about each of them.
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Have we seen videos where there are non-sources or obviously bullshit sources, or stuff from /r/thathappened on reddit? Yes. We even see whole "game journalism" sites who only seem to take the top voted reddit post from gaming and turn it into an article.
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Completely made up stories. Obviously.
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Bots adding views to videos. Obviously.
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Bots commenting on videos. Obviously.
It isn't surprising when it all gets put together. I'm looking at a reddit post from a year ago where a dude made a Youtube channel that is all AI. The only thing he has to do is click "upload video" He doesn't write, he doesn't do the artwork, he doesn't pick the music, it's all AI generated.
I just had to yell at my mom yesterday because I saw her scrolling through her phone and she was looking at all of that AI/bullshit stuff that's at the ass end questionable websites."40 people who are gay and 8 will shock you." "Take one tablespoon of this and you'll lose 100 pounds" People do fall for it.