Most of the bots all work the same, as an example they find a popular post and repost it knowing it will be popular, and if you have multiple bots all the better while you copy popular comments from that same thread and make those comments knowing they will be a net gain. Of course karma didn't matter so the reposting of popular content was just to make the bot look like a real user by having content and comment history for the real end goal of propaganda networks where articles can be posted and bots can go agree, disagree, or be antagonistic (trolling) to xause dissent towards specific groups. Advertisement networks where products or services are promoted by either posting links and discussions, or by searching for discussions in progress and recommending things. It all boils down to manipulating and influencing for a favorable outcome, it helps control the narrative when you can promote or bury the statements and things you want and doing that requires lots of followers or lots of bots.