I do not know about the others, but I know about Kucoin (I have not used it before) that it is one of the best no kyc but centralized exchange to use. And if someone is not going for frequently trading but just exchange of fiat to crypto and vice versa, then decentralized exchanges are best for privacy that most centralized exchanges can not give.
All of these platforms require KYC, but leave the user with the ability to use it without verifying identity at a certain level and must verify it when it reaches that level.
As long as exchange between cryptocurrencies and without converting it to cash, most likely no KYC will be required.
Binance was like that, they lowered limits and then imposed full KYC
[1].
So it will happen with all of these platforms.
Unless it's a truly decentralized platform, everything will happen.
[1]
Binance Expands Global KYC Requirements to Further User