cLime

Can you see the number of support tickets about hack/cheating? Niether can the rest of us. But you can just watch some eu streams of BNS and you will see. The moment you can see the name of the opponent in arena silver rank, that person is using an addon even if that is a minor cheat.

Dunno about CN but RU still has official competitions. That could be why cheating is not allowed in that region.