If you're cheating then this is how you get caught. Climbing above your current Combat power in tower. (Everyones progress is recorded to be seen by the entire server). Killing battles above your CP in events. (Progress there is also recorded to be seen publicly by everyone). Attacking others above you in Contest. Clearly while this cant be seen publicly im sure the devs will know on thier side as they must tally progress weekly and also it becomes obvious when you are above everyone in the ranking and you are weaker then the people in the same ranking.
My account's fine for now. I didn't attempt anything that requires more cp than my best team. In pvp, I turned everything off. Everywhere else, I kept my dmg mutiplier to x3 except for rival battle, never used def mutiplier and god mode.