Admins having the power to ban user based on any offense, no matter how abusive or unethical they are, is not a characteristic of an open/decentralized social n

Admins having the power to ban user based on any offense, no matter how abusive or unethical they are, is not a characteristic of an open/decentralized social network. Are admins elected? Is there a democratic process where trials can happen based on users actions?