I've never used one, why don't they just like, have a camera to scan a qr code of your crypto wallet on your phone, and send it to that address directly? Anyway I don't think it can be worse than having to take a picture that includes your face, handwritten message, id, and have to retake it 20 times because the exchange won't accept it if it is slightly blurry, plus linking a bank account etc., needing to copy a private key and send another transaction seems like it would be way less annoying and creepy, even if the tradeoff of crazy high fees makes it not worth it for most people.