They ban bots frequently but implementing anticheat software would be against the law in their country as far as i know. That's why they also can't detect if you use mods or damage meters or anything else that is just clientside. They detect how people act as bots and they ban them frequently.

But yeah, they said they will never burden us with spysoftware like most other mmos etc. do. Dunno if that's cause of japanese law but that's their stance on it.