It depends on what exchange it is, decentralized or centralized exchanges. if it is a centralized exchange surely you need to KYC in order to make certain limits of the transaction. However, if you register on the decentralized, it does not need any KYC approval. Of course, you must also consider what to choose whether the centralized and also decentralized.
In this case, it is not in the Bitcoin but in the platform itself. We may ignore the T&C if we do not register on that kind of site. So, please analyze first about the exchange to make and cash out your Bitcoin into cash.