1. buy BUSD on Binance OTC market using RMB 2. transfer out BUSD to ftx using BSC (fees: 0.5 BUSD) (T+1) 3. buy BTC on ftx using USD (having trade fees) 4. withdraw BTC to non-custodial wallet (> 0.01 no fees)
seems the most economical way to buy bitcoin using RMB