I don't understand this line or reasoning. People use various cryptocurrencies to buy and sell legitimate products and services every day. Is the argument just that they could probably have done it some other way?
It's not really the same because we already have the model. If China stopped letting us have it tomorrow I'd doesn't matter because... We have it already
Since that's not what the world was like before copyright, and since copyright is more often used to rip people off than protect them, this seems unlikely.