In a nutshell, from the player's point of view the important global CCS rules are the ones about camping. Camping is not allowed in any CCS sim. No selling of XP for money or services is allowed either.
All the other rules are up to owner of each sim. They can ban you, kick you or kill you as they like. If you are unhappy with their rules or how the local GMs act in a specific sim, you are free to leave the sim and never go back.
If the punishment for breaking a rule in the sim involves a CCS punishment (usually an XP dock), there is a global appeal process for that.