The problem of this no kyc exchanges, is any hard issue, is too hard too solve .
But for who want stay anonimus ,for some reason, its the best choise . but be careful , are so many excanges offers a easy no kyc excanges tnat are simples scamms .
I prefer to use centralized exchanges such as Binance, Bittrex, or other exchanges, although those exchanges need me to verify my account by sending the document. At least, if something happens to my account, they can help me solve the problem and I do not confuse where I should report the issue. But in the decentralized exchanges have their own policy to manage their users. So whether we want to use DEX or CEX, we need to think twice about which exchanges we will use to trade.
It depends on the user actually since no matter what we choose there are pros and cons of both exchanges. Centralized exchange is just following the government protocol if they want to continue their business that's why a mandatory KYC for all user is needed in order for them to track whether the user is using a clean money or not.
The risk of using a decentralized exchange is quite high compared to the centralized one but just like I said, both have their pros and cons. I prefer decentralized one since its less hassle although, not all exchanges are worthy to try even if they say they have or no KYC requirements.