I don't advise you trade with platform that does not require kyc the risk is high.
From my understanding, the only reason allowing them to not ask for KYC is the fact that they're based in Seychelles.
The platform has been around for many years, and they also own a licensed fiat exchange[1] (OKCOIN) in the U.S so I don't think there is anything worrying about them.
[1]
https://www.okcoin.com/licenses.html