Maybe some of the obviousness is a sort of camouflage in that if it looks like a fishing scheme, people at YouTube won’t look any deeper. I think the actual goal of the bots is to manipulate the algorithm. Like, most of the time, the obvious bots just get ignored, especially on videos from bigger creators, no reason to put effort in to making them believable.

Like, maybe they comment on video A to show “engagement” with that content, then they go and comment on video B. Fool the algorithm into associating people who engage with video A as the same kind of audience who would engage with Video B. Thus getting the algorithm to recommend video B more often to viewers of Video A. For something like that you wouldn’t need the bots to look real to other commenters, and having them seem like innocuous fishing scam bots might reduce the scrutiny on their activity.

I could see a lot of different reasons to do that. Could be as simple as some shady “Viral marketing consultancies” trying to boost a client’s channel in the algorithm. Could also be something more comprehensive and nefarious, like trying to manipulate social discourse by steering whole demographics towards certain topics or even away from specific topics. I do wonder how much the algorithm could be nudged by an organized bot comment spam ring.