Re:EU fines Mastercard more than half a billion euros
by MagnumOpus on Wednesday January 23, 2019 @08:45AM
(#18978006)
Technically easy to replace but a hard-to-displace monopoly (duopoly) solely due to network effects. Like Facebook, eBay or WhatsApp in the tech space.
> to compete you'd need an entirely new card system that would be incompatible with the others, and thus your card would be unusable in most places
That's basically the definition of hard to replace.