Has anyone used KCC to transfer Bitcoin??
Not bitcoin, but an altcoin.
Any bitcoin address that do not start from 1, 3 or bc1 are not bitcoin, they are altcoins.
My advice:
If the amount you want to transfer is not much, you can convert it an altcoin that have low fee, send it to OKX. Move it from OKX to you bitcoin wallet.
OKX charges $2 for bitcoin transaction.
If the amount is much, you have to take note of the trading fees. Trading fee is in percentage. Which means that trading fee may take higher amount if you are dealing with huge amount of money.
Edit:
I have just checked this, the fee on OKX has also increased recently, about $9 now with bitcoin at $28000. Bitcoin fee on exchanges are usually expensive.