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.
There's no meaningful attention, here. Until it is on the US Gov't radar, this 'attention' is just a collection of upset redditors furiously posting forum messages which will fissile out in a few months, at most. Besides, it's not like you can boycott Mastercard or VISA.
Every single time I have the option to buy an event ticket by SEPA transfer or credit card, which is actually very often, I choose SEPA transfer.
One time I even used Bitcoin.
It does seem to be mostly event tickets that have this option, for some reason. And I'm not talking about the TicketMaster monopoly, either.