There are clever solutions to this. Escrow works even in bitcoin. Then at a certain point you call the police. No reason to insert a hugely expensive third p

There are clever solutions to this. Escrow works even in bitcoin. Then at a certain point you call the police. No reason to insert a hugely expensive third party in a 2 party transaction. Edit: It's more than one hugely expensive third party if you consider each level of local government gets involved.