There was one for a while that told you how many times you left a comment saying “nice.” It had a leaderboard and the top ones had done it some tens of thousands of times.

I modded a niche outdoor community sub and I banned every bot that found its way there. Sorry, but we don’t need a metric conversion bot nor a grammar correcting bot.

“most bots” leave auto summarize bot, reminder bot, repost detection bot about of that.