> Suppose there's a bot that responds to every comment with positive sentiment about ivermectin with "You are not a horse" with a link to WHO guidelines. Would Twitter call that a good bot or a bad bot?

It would not only be classified as a bad bot (if unsolicited), but it would violate Twitter's automation rules [0]

0: https://help.twitter.com/en/rules-and-policies/twitter-autom...