You need to verify your identity in order to use your Revolut account. This policy is in line with a banking regulation commonly known as 'Know Your Customer’ (KYC) and is the process of a business verifying the identity of its clients. It is simply an anti-corruption and fraud measure.
Until you have completed this step, you are not bound by Revolut’s General Terms of Service. Any money added to your Revolut account before verifying your identity will be made at your own risk and are subject to applicable fees.