I've seen AI-generated comments be used quite a lot, even by real people. When asked why they did so, they could not explain it, or claimed "to reduce spelling mistakes". Which makes no sense; real people make spelling mistakes and typos all the time. Why would that warrant the use of AI? To me it seems as if some people are just mega-lazy, so they use AI; and for testing, too. When they do so, though, they waste the time of other humans, as these other humans suddenly have to "interact" with AI, without this being announced. It is a form of cheating, IMO. On youtube you now find many fake-videos created by AI, without announcement - I don't watch these as I consider it cheating too, when not labeled as such. Admittedly it is getting very hard to distinguish what is real and what is fake. There are some ways to find out, but it is getting really hard to distinguish accurately. Sometimes you see e. g. 10 funny animal videos and only 2 are fake-AI, so these people combine cheating with non-cheating. Very annoying - it degrades youtube, which isn't so bad actually since that is owned by evil Google.