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.
For fiat and other similar transactions, I think that was understandable because they are centralized but about p2p? I seem to disagree with this because p2p supposed to be anonymous right? It originated on a decentralized platform but then later on adopted by many centralized exchangers but no doubt that a user can gain more confidence if they know the person they are dealing with.
I think nowadays many people doesn't care about their privacy anymore. In the case of bybit banning users, it will be better if they gave some early warnings first for each of their users because it's too unprofessional if they will just ban them immediately.