Why is it the people posting positive comments who are "responding to incentives" by posting more, while it's the people posting negative comments who do so by stopping posting? Like, your exact points work equally well with the polarity reversed: the anti-AI influencer/grifter ecosystem is well-developed at this point, and many people desperately want AIs to be useless.

I don't know if the original claim about sentiment is true, but if it is, I don't think yours or blibble's (conflicting) claims about the reason are very believable.