I don't know if my experience is usual, but readily ride buses and trains that air so crowded I almost have to physically force my way into them, and I take Lyfts occasionally, but I never, ever opt for the shared ride.

Maybe it's just me, but something about sharing a ride with one or two random people in the back seat of a sedan just seems unpleasantly awkward. Whereas a bus has enough people that you're a face in the crowd.

(context: US, Boston/Cambridge/Somerville area)