Yeah, you can think of it as a simple transaction fee for debit transactions, and a full blown credit and risk shifting system for credit transactions. The banks charge high fees for credit transactions because they’re actually lending money and bearing some credit risk for them, whereas the debit transactions are just moving money from one account to another.
Radio Shack limped along for maybe a decade after their core business stopped making sense, because of their cell phone deals. This Onion article from 2007 captures the cultural place that RadioShack operated in at the time, and they didn’t file bankruptcy until 2015 (and then reorganized and filed bankruptcy again in 2017).