By the way, I am yet to find policies in regards to risk screening of incoming transactions by the OP's service and therefore here is my question to the OP: what are risks if somebody sends 50 BTC coming from OFAC-listed address to your service?
That's also an information i am waiting to read from the op, i know they already said they do not withold csutomers funds, and that at the most they'll return it to the address from which they received it. However, op didn't say reasons that could warrant them denying a customer an exchange of their funds and returning the funds back to them, do they blacklist addresses and utxo's based on LE list or request? I believe op should provide answers on this when or if they come back to this topic.