That's like saying you can't pay one who doesn't have a bank-account. You can either give the money (or bitcoin) to some service that keeps them for this person and give them the access to it or find another way to do it. At this point, I'm pretty sure that the burden of proof goes over to the other person and they will have to show why they didn't work with you to get the money.
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You cannot pay someone in bitcoin who hasn't setup a wallet or shared a bitcoin address with you...
That's like saying you can't pay one who doesn't have a bank-account. You can either give the money (or bitcoin) to some service that keeps them for this person and give them the access to it or find another way to do it. At this point, I'm pretty sure that the burden of proof goes over to the other person and they will have to show why they didn't work with you to get the money.