Personally I think that the use of voting bots is an issue in an of itself and shouldnt be used. BEcause of esactly what you found out with @muxxybot. That is likely the case to some degree with every bot. And it creates a form of artificiality to the community.
Wisdome of the crowed is better then the reactionarry actions of a bit in my opinion.
But I do understand why people are uing them, as it does get them value. But it is a form of an exploit, you could say.
muxxybot is not simply a bot--it is a team of curators who upvote good content. But to get support, they offer a very small upvote for those who delegate to it. Which makes a lot of sense. But also easy to abuse, so I'm happy we were able to put up a better system to check who delegates & what gets upvoted because of it, to make sure it is clean of plagiarism.