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? Anyway I don’t think it can be much worse than having to take a picture that includes your face, phone, 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.