All of the above do not require any KYC. A few days ago I made a transaction on Poloniex Exchange which gave me much pleasure because that was very easy.
it depends on what product you would like to use. In such exchanges, you may not be able to deposit or withdraw fiat, trade derivatives, trade on p2p platforms minus having to first verify.
I see some platforms like Bybit are already banning users from certain Countries, which means a compulsory KYC verification is eminent.