Earlier quoted context omitted.
A class-based explanation and Muni being a terrible service "ripe for disruption" are not mutually exclusive. You can't, however, argue that a private bus service that requires a smartphone and costs 3x what regular public transport does doesn't have interesting effects on who can and can't use it.
Smartphones may have been highly class correlated in 2006, but they're not now. You can get one prepaid for around $30 at any cell phone shop. 77% of those 18-29 with an annual income under 30k own a smartphone.[1] Atrocious public bus service impacts the poor much more than those who are better off: someone with a salaried professional job who comes in late a couple of times a week due to Muni will usually not even…
But sure, smartphones are pretty widespread these days. If that were the only factor biasing these busses towards the wealthier end of the society, then the bias wouldn't be very much.
It's not the only factor.