For security reasons, many exchanges currently require KYC, of course this is good because to ensure that users are real and if a problem occurs it is easier to solve, but I don't like KYC because I think exchanges that require KYC are different from the concept of anonymous cryptocurrencies, and this is what makes me prefer trading on exchanges that do not require KYC and 2 exchanges that I think are good are MEXC and Kucoin.
It is not because of security reasons but because the authorities/ government want it that way. To provide any party with your KYC-Data is dangerous.
KYC and anonymous cryptocurrencies never fits together and if someone really wants to be anonymous in the internet, it takes a lot more than just not performing KYC to another party.
Why KYC is extremely dangerous – and useless is a very goog thread to understand the dangers.