Is there a difference between Legit Bots, i.e. that post some kind of useful information similar to an rss feed, and illegit bots, i.e. that exist solely to upv

Is there a difference between Legit Bots, i.e. that post some kind of useful information similar to an rss feed, and illegit bots, i.e. that exist solely to upvote other peoples content or inflate follower counts?