Gate Io (Gatecoin) is a bitcoin exchange based in Hong Kong. I initially became a customer of Gate because they were deploying many bitcoin fork coins in a timely manor. Gate now requires KYC for withdrawals, their site says: “KYC(ID Verification) : Identity Verification is required. Please complete identity verification and enable 2FA. Otherwise you can’t withdraw your assets.” The withdraw fees are pretty high too (BTC 0.0005 withdraw fee).