Interoperability would indeed help a long ways in many markets but it's antithetical to the monopolistic business models of the current tech industry.
Card processing is something you can do on a cheap microcontroller - the only blocker here is EMV certification. I'm sure with all those millions (billions) collectively poured into the industry they could've released a cheap EMV-certified module that can accept payments locally, or failing that, bypass the certification problem by building their own, interoperable system end-to-end so that customers at least just had one app to install.
It reminds me of a company here selling(?) powerbank vending machines - seems like they're still around, at least online (I can't imagine this thing ever making money, but I suspect it was more about "growth & engagement" and resume fodder than building a sustainable business): https://chargedup.theup.co - the problem is that for you to take out a powerbank, you need to install an app on your phone. This automatically excludes the customers whose phone has already died even though they're the most likely to pay for it. I used to see their machine at my local bar for a couple years and I don't recall anyone ever using it. At some point it disappeared and replaced by a competitors' that at least has a built-in card terminal. Still don't recall anyone using it ever, but at least I guess you now technically could if you had no other option.
Card processing is something you can do on a cheap microcontroller - the only blocker here is EMV certification. I'm sure with all those millions (billions) collectively poured into the industry they could've released a cheap EMV-certified module that can accept payments locally, or failing that, bypass the certification problem by building their own, interoperable system end-to-end so that customers at least just had one app to install.
It reminds me of a company here selling(?) powerbank vending machines - seems like they're still around, at least online (I can't imagine this thing ever making money, but I suspect it was more about "growth & engagement" and resume fodder than building a sustainable business): https://chargedup.theup.co - the problem is that for you to take out a powerbank, you need to install an app on your phone. This automatically excludes the customers whose phone has already died even though they're the most likely to pay for it. I used to see their machine at my local bar for a couple years and I don't recall anyone ever using it. At some point it disappeared and replaced by a competitors' that at least has a built-in card terminal. Still don't recall anyone using it ever, but at least I guess you now technically could if you had no other option.