Internal transactions all over the world are routed through US companies. I have paid using Visa or Mastercard at some point in Australia, Indonesia, India, Frnce, Sri Lanka, Singapore, Dubai.....

its not exclusive, but there is a problem with network effects. From the point of view of a business why should they add support for a new payment system no one users, from the point of view of consumers why should they sign up to a new system that no one accepts?

As I said in another comment the most likely alternative is a more decentralised system that all countries/currency blocks that want sovereign payments can get behind.