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> You would be amazed at how much money a bank can make on card interchange

Not in Europe. Do you have any links?

> Also most central banks don’t have negative base rates,

OK not negative, just zero Eurozone is 0%, UK is 0.1%, Scandies are zero or 0.05% https://www.global-rates.com/interest-rates/central-banks/ce...

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Not that are publicly available. But I do work in large fintech, and know how much revenue we make from interchange and it way more that you expect.

While interchange in the EU is capped, it’s not zero. And interchange earned from customers travelling abroad in countries with very high interchange rates is quite significant.

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