Some of ye have mentioned public, out of game blacklist. Funnily enough pre crossworld PF those were a thing amongst some NA servers in some circles. While those aren't innately bad, as you have to be a special kind of bad to land on one. They are however subject to manipulation, and therefore not the best solution. Furthermore, some have taken issue with my usage of "leech" and "parasite". This terms are warranted when a player gets told how to play their role and continues not do so. You are a waste of space at that point, no ifs ands or buts about it.