Over one percent of League of Legends players have been banned

Handling antisocial behaviour has always been a problem for online game developers, and MOBAs like League of Legends certainly get the worst of it. The inherently team-based nature and slippery slope gameplay in MOBAs makes it very easy for one antisocial player to ruin a game and cause your team to lose. The problem is normally tackled head-on with a report tool and a suite of hired GMs, but what do you do if your game is free-to-play and has over 15 million registered players?