Perhaps another solution could be for the most famous and bigger bots to create a curation group, in which a group of curators decide which user will receive a free upvote daily.
In fact, if every bot did this I bet most people who are against bots would reconsider their opinion on this subject.
Well, I know that @appreciator already does this-- it (its owner) works with the Steemit Bloggers group (which I happen to belong to) to reward exceptional content as decided on by members of the group, as a whole.
That’s right I am also on that discord!