lmao so you think people should get banned for spying? It's apart of the game. My group is top in the server and the last group we face in war always has spies on us but what do we care? They are helping us in the end of it because those accounts they create will be backups in the war.
Think of the spies like that or you can just wait until everyone is on the battlefields you want then at the last 15 seconds you move everyone for ex. you place members of fields 2,3,5,6 but at 15 seconds you start moving them to 1,2,3,6 or 1,3,4,6. There are so many ways to handle the spies.