My question is why many traders to buy and sell use the spot trading (where there are buy, sell buttons and order book) with fees instead of using the "Convert" tool without fees?
Thanks
I think maybe you are missing the two functions together. Simply, when traders are converting, they are either switching their coin to another coin and that goes with no charge like I know from binance. You can convert btc to Usdt or any other or the other way and you hodl the new converted coin in there but if you are transferring it out, you get charged fees depending on the charge. Spot trading is different from converting your coin.