And why should KYC be held by those who trade not a lot of money on the stock exchange. Where can there be fraud if I have 500 dollars in total on the exchange? KYC is needed only for large investors and players on the exchange.
You are right, such a system is present on Binance, on Trade.io and some other exchanges. Up to 2 BTC trading, input and output of cryptocurrency is free, without KYC and it is convenient.