Exchanges, as long as they have a license to operate will always be kyc complaint, and this is because, money regulation is way higher on exchanges than it is on gambling casinos, and the eyes of the government and regulators are also more on centralized exchanges, than it is on gambling casinos.
And you should also know that sometimes, when the company is still new, they tend not to bother users with KYC verification, because at that time, the system is either but built yet, or they are still very much busy trying to fix the bugs and all that, for those who register at that time, they may be told that the site is kyc free, but they may as well forget to tell us that they will likely activate kyc in the near future.
And some companies, be it a casino or exchange, won't let customers know when the kyc system is activated, which is actually unprofessional.