Minecraft wiki entry for Building_a_metropolis, associated text: Auto-Run
There is no government. No leaders. No admins even. There are only command blocks. These command blocks are specially programmed to enforce the rules of this city.
While people may have their personal freedoms, the owner of the city can program the command blocks to enforce any set of rules, with varying degrees of strictness. There can be any system. It's simply not human run.