I've never been banned, muted, or even kicked from any c-rpg server. That being said I have seen the ridiculous abuse that goes on on the NA servers.
1. First and foremost being that admin positions are given to allies and friends of the clan that runs the server. Hmm.. how many admin positions did hospitaller and eastern tsardom have on the NA servers before they joined the Northern Empire? Now how many do they have? It seems like every member in the NE has admin powers now. I've donated money to help support the NA servers but I don't think any Fallen member will ever get an admin position on the servers. Not that I think Fallen should, it should go to people who play often, are level headed, and will enforce the rules fairly. Not used as a political tool.
2. Changing server settings and maps to suit individual needs. Is banner balance on or off right now? Why can I change teams sometimes but not others? Why did the map get changed for no reason?
3. Wanton enforcement of rules. Watch out if someone doesn't like you. Very few warnings or kicks, almost always a perma ban, even for the most minor of offenses. (such as bumping into an admin with your horse in spawn, on accident)
4. The most egregious of all is the abuse of the strategus server. Restarting the server when losing a battle is game breaking. Kicking and banning players during a strategus battle is game breaking. Just the fact that you're administrating your own games during strategus is game breaking, especially so when only friends and allies have admin powers.
All of the c-rpg servers should be funded, supported and ran by the community as a whole.