Did you get a message in battlelog stating why you were kicked?
There could be a few reasons for a kick such as someone with a reserved slot or an admin joining a full server and the server would make room for them by kicking someone.
Sometimes players get kicked for high ping with the limiter we have in place, and sometimes random shit happens with BF4. I've been kicked for no reason, not by our admins, not by the ping limiter but just because the game is sometimes buggy when doing multiplayer.
To answer your question though, we have no rules against using a UAV or any other weapon or item on any of our servers.