I have seen so many posts with low to mediocre quality getting upvoted by tons of bots bringing down the quality of the platform to the eyes of the people coming through this platform. Though, there is an obvious incentive in voting, the quality of the vote itself brings about questioning in relation to the inherent quality of a post.
In almost every case, those bots were front running shitty human whale curators who upvote the same author 100% of the time (for reasons of their own, which i won't touch on).
There are maybe 10 honest to goodness people that have a measurable effect on reward distribution. and afaik, all of them are people, not bots.