Of course Visa and Mastercard still have a big role, especially in the brick & mortar. But when looking at e-commerce, the share of card payments is 40%. I don't think it is very relevant to discuss "duopoly" and say that they have the power to censor user content - because they don't. If they ban you, you still have many other options. AFAIK the point in the article was that we should break the credit card duopoly because they have too much power. I don't think that is the case here.
Do you think that the credit card companies having too much power is a big problem in the Nordics?
I'm not sure about the other Nordics countries, but Denmark still have its own card solution "Dankort". It's not nearly as popular as it once was, and I would say that most cards are now dual-branded as VISA/Dankort, where the card will work as a VISA card, if Dankort isn't supported.
Our politicians and banks probably don't see it this way, but having a local alternative can help keep MasterCard and VISA in check. If they become to expensive or unreasonable most people already have a competitor in their wallet, one for whom fees are strictly controlled.
Do you think that the credit card companies having too much power is a big problem in the Nordics?