There are some surviving national circuits like PagoBancomat (as the sibling comment from Scrollone) and Dankort (Denmark) and girocard (Germany). My personal impression is that they are slowly going out of fashion in favor of visa/mastercard only (probably because they can’t offer better prices than them).
I don’t see a solution to the duopoly, apart from lobbying politicians to support this national payment infrastructure. Especially in recent times I can also see how some governments might not want to rely entirely on two US companies for running their entire economy, so something might move on that side, so there’s hope on that side.
The EU has already been moving on this front in the last years by forcing the banks to provide programming interfaces to initiate bank payments, and that’s why you can now see more and more options to “pay by bank” online in EU. These online payments generally skip card circuits and run over normal SEPA bank transfers.
More info here on the last part: https://en.m.wikipedia.org/wiki/Payment_Services_Directive
I think you got a bit confused… FEX is used in the steam frame (VR headset) because it uses an ARM processor to save battery. The steam machine uses a normal x64 CPU and appears to be using some relatively standard pc hardware, so no compatibility layers are needed for windows (only drivers are needed) I doubt you’ll be able to install windows on the steam frame though, for the reason you say (arm compatibility is a mess).