I'm still trying to understand why people is getting banished when they type commands, anyway the ban is temp, you should be able to get back in some minutes...
I believe the athena server recognizes most / commands as GM commands, so when the server checks the client/account, it figures out its a normal account, therefore thinking the person is cheating, im not sure of this nor can i prove it, but it is a posibility
I found that some /commands needs specific packets which are still not implemented on tmw client that's why the server bans users. It happens also to me even if I'm the most powerful GM. Now they're disabled, so ban shouldn't be a problem anymore...