Many AI systems are used in the backend to increase revenue. Netflix has a very complex recommendation algorithm based on deep learning/statistics. Amazon uses a lot of machine learning to optimize transportation (NP-hard problem!) , sales, etc..
For weeks after that my recommendations were filled with bullshit such as "PROOF ALIENS BUILT THE PYRAMIDS!" and such.
So yeah, maybe those "very complex recommendation algorithm based on deep learning/statistics" is perhaps not always such a great idea. In this particular case, it's just a mere annoyance for me, but imagine a 13-year old watching a few genuine documentary videos on Egypt and then seeing this bullshit; they don't have the capacity I have to see it's bullshit.
And imagine if it was on a more serious topic than who built the pyramids...
If I were to ask a YouTube engineer "why did I get this recommendation specifically?" then the answer would probably be "dunno".
An additional issue is that the YouTube of yesteryear was much better in browsing random videos. Now everything is based on what I've watched before, instead of just "give me a list of science videos" or whatnot. This is also an issue I have with Netflix (or rather, had, since I no longer have an account).
It seems to me that inscrutable mindless AI learning has a part in the spread of misinformation and bullshit. I'm not sure how large that part is, but I suspect it's significant. I'm hesitant of the total value in these cases, regardless of what it may do for the bottom line in terms of revenue.
[1]: I'll just drop the link to it here in case anyone's interested: https://www.youtube.com/watch?v=hnsNwwwHm2I
And yet, it's harder to find anything to watch than it was when they'd just let you browse by genre.