I'm glad the Mastercard-Visa duopoly is finally getting some attention, these companies shouldn't be allowed to exercise the financial control they do. Payment infrastructure is not a free market - you can't just choose to pay via some other processor if they turn you down, they ARE the processors. Therefore, they should be under intense scrutiny when they refuse.
these are basic things we need to exist in society, we should not be at the whims of private organizations.