On my 3rd day and no ban..
Don't be too excessive on stages and arena..
I just got excessive on tower only for those free 2* yellow equipments for more cp boosts..
Got to 70k CP because of luck (do the novice draw and special role ones only to get more frequent heroes to rank up when spending green tickets)
Always buy those daily event offer, 1000 dias for a 5* is cheap..