Have you ever, like, actually used the shared ride options?

It can be handy when you're not in a hurry, but as long as people are involved, and they aren't always where they say they are going to be, there's a pretty hard upper limit to how efficient things can get.

A shared car is great when you have little money, few other options of transportation, and the route allows to share it with other people.

I did it a few times. But usually when I need a ride, it's because I'm in a hurry, and paying $5 more is no object. Else mass transit suffices. This only works in urban areas, but it's where the most profitable ride-hailing markets seem to be anyway.