> I can't read the rest of the article but they mention the duopoly of Visa and MasterCard (and I guess Amex is the only other issuer?) causing a stagnation.
Diners Club is also a thing.
Diners Club is also a thing.
My understanding is it's pretty tough to compete with the big guys in this market because you need to build out a huge network of vendors who accept your card for it to be useful to customers.