Don’t they also have moderators? People to enforce the rules? Plus an administrator who owns the server and can even remove moderators? That’s a hierarchy.
It's just a server, not governance over their collective. Ideally they had backups or people owned their own data on a DHT or Blockchain. Otherwise the administrator has custody over the data...similar to a bank having custody over funds. My understanding is if someone breaks the trust, the victims would have a way to settle grievances...probably through a fine or some other financial means.