I'm pretty sure every CEX or even DEX will start to require people do KYC, based on where they're operating.
DEX stands for Decentralized EXchange. and based on their nature they can not ask for KYC because there is no centralized authority in there to take the KYC and check who is trading what with whom! maybe there are some weird designs calling themselves "decentralized" while they are not and then they ask for KYC but that is not what DEX is.
there is no DEX that is fully decentralized yet. there is always centralized servers, centralized order matching, centralized domain name system, etc. this is why the founder of etherdelta was charged by the SEC. if it were truly "decentralized" there would be no one to charge:
https://www.sec.gov/news/press-release/2018-258at the same time the etherdelta charges came down, the largest DEX (IDEX) announced they were introducing full KYC. i'm sure the SEC had some influence on the site operators.