It means accounts that consistently upvote posts that end up being banned.

The naive take is that this will remove bot/brigade swarms that are collaboratively boosting content that breaks site wide rules. You can derive ulterior motives from this if you want but I’m pretty sure that’s the basic premise.

I have no doubt this will be leveraged by the far-right to sow more discord. They already have a history of raiding subreddits with false flag attacks to get them sanctioned until it escalates into full blown subreddit ban. This is all but formalizing the mechanism.