the only ot ddoser i know is ryan and he's able to bring down basicly everything with his botnet d; he was drunk and tried it like 2 servers before his last one around 1,5 years ago and he was able to bring down valhalla (realots), tibianic and realshit's mastercores.
Can't say that's a very smart one then. Being known for something like that. Then having those boast about it.
Besides.. OT servers isn't even close to .. everything.