The rumor is various Bitcoin factions used to DDoS each other when they got really riled up about something. Of course, censorship, banning, threats and FUD were considered normal practices there (and probably still are). Compared to that level of animosity, I find that Gridcoin is a great community and almost all polls show solid consensus on all important matters (most recently, fixed POS block rewards poll, 92% in favor). Some friction is unavoidable unfortunately, but its absence is usually even more worrying (because it often means that people are simply unaware of issues and are drinking the Kool Aid).