I once pulled up to a bar 2 minutes after getting a call. The passenger got in the cab, and the passenger's (male) friend had assumed the pose that marked him as waiting for a 'ride'. (The observation is typically used by scumbags in Scottsdale to trick women waiting for a 'ride' into getting into random cars, which is why the taxi company I drove for lobbied to force ride-vehicles to have some sort of branding.)
Me: is your friend waiting for a 'duper? Passenger: 'duper? (Confusion, then...) do you mean UBER? Me: FRIENDS don't let friends get DUPED by eww-ber! Passenger: LOL.
Really, though... "Ridesharing" is unsustainable for many reasons, the main one being that cars are expensive, and should the economy rebound, people won't be willing to wear out their cars for peanuts.