It's actually free right now so the drivers don't have to have passengers near them. A Detroit bus driver died of COVID early on.
The more troublesome thing about Detroit public transit is that it's not convenient. It runs erratically, and the city of Detroit is geographically very big so it's difficult to accommodate everyone. Plus the city has a separate system than the suburbs so it can be wonky.
I wonder if the show assumes Bob actually lives in Detroit