Out of curiosity, even though the other party doesn't know your details, doesn't Revolut know that you (the real you) sent X amount of USD to someone else? They obviously don't know why, but couldn't they connect the dots and realise that you send curious transactions to multiple entities and ask you why?
I use it to send money to many people, asides trading bitcoin, and I also use it to receive money from the same and other people. They have never asked me anything, so I suppose they don't know about this particular activity. The moment they start freezing my money, asking about the activity, like Paypal used to do in the past, it'd be a good time to abandon Revolut.