Except those cards aren't global. In countries with untrusted banking systems they aren't even for sale or they are via their own regional bank that a Western p

Except those cards aren't global. In countries with untrusted banking systems they aren't even for sale or they are via their own regional bank that a Western processor will just refuse to accept. There's still a big problem out there with foreign transactions and the credit card system. Paypal kinda handles this in some scenarios, but it still is unsolved, especially when you're discussing non-trivial amounts of money.