Binance have launched a DEX that doesn't require KYC as far as I know and its quite user friendly just it hasn't received the same volumes as the CEX version of the exchange, but these services may become more popular as more regulation is put into place that requires FATF guidelines to be followed and they can still operate without these restrictions
of course they dont have to require a kyc because its a decentralized version . i never seen a decentralized exchange that require a kyc but centralized version yes they are possible but not all decentralized exchange are user friendly but most of them are not but binance was well known to be a user friendly exhange before so they will just use the same set up on thier new decentralized exchange version . why would this become popular if it will regulated ? when people only use decentralized exchange to avoid regulation .
While I agree that decentralized exchanges should not require KYC, IDEX is doing that. So that means it is possible. Although I would think that because of what IDEX did, it kind of lost a big part of its being a decentralized exchange. But it is still a decentralized exchange by its other features.
IDEX is one of the most active decentralized exchanges but I think Binance DEX is leading in the competition.