Separate economies don't necessarily have to be equal in capability. One may be the dominant while the other operates closer to being a black market, while not

Separate economies don't necessarily have to be equal in capability. One may be the dominant while the other operates closer to being a black market, while not necessarily being an actual black market. Maybe it would be based on cryptocurrency, or a more traditional form of currency that is centralized but isn't USD, for instance. Or someone with a lot of money decides that having dominance over a new economy takes the opportunity and forms their own "competitor" to Visa, but it operates within the economy that Visa decides it doesn't want to be a part of. Then again, maybe Visa one day leaks enough customers that it decides it's not worth being as moralistic.