I mention amex, visa and mastercard because they are the most used international means of payment and also because having all 3 with blockchain technology would increase the offer and therefore companies would give promotions or some way to attract customers as in all businesses increasing the offer. the supply price is better and thus there is also more demand
I thought I mentioned them?.
My point with Amex was they're not accepted in many places due totthe high fees..
Realistically I'd like to see banks team up with supermarkets or supermarkets owning banks (like tesco have a bank in the UK). So the company can manage everything for the customer if the customer wants them to and they will still get faster payments - even if done via a blockchain.