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?