I don't think they can ban people mate. I got it once but I just joined a team that was doing it. If I do get banned whatever it will be a bitch but shit happens. There will have been too many people that have done it so if they are going to they may impose a temp ban for each time you have been in a team that does it ie. If you have been in 3 then 3 days of ban but actually say it's because of the crota cheat 7 times is a week and so on.