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Yet pretty much every country uses non visa/mastercard as a first line payment and they are insanely popular.

…within that specific country.

I know that JCB exists in Japan and Mir exists in Russia, but never saw them accepted anywhere except these countries respectively.

That is precisely what this submission is about. They're making these local systems within Europe interoperable.

I saw a massive advert this week in Singapore for UPI, "pay like you do in India". Systems like Alipay are accepted very widely too.