Minecraft wiki entry for Multiplayer_survival, associated text: These servers are brutal, with only a bare minimum of rules (which only prohibit things like god mode hacks, in which a player is immortal, or activities that cause things like extreme server-side lag or intentional map corruption), and an unmoderated chat. These servers may even be prone to crashes caused by players or map corruption, and players with hacked clients are the norm, not the exception. Griefing is all but an inevitability for players who choose to build anything out in the open.