I'm happy Lyft is demonstrating that it actually cares about its core/founding values of decreasing car usage.
They could have viewed this as a distraction to expanding its existing dedicated-driver model, in order to better compete against Uber. (Lyft Line is just multiple passengers; Sidecar already does "driver destination" aka real carpooling, but they're also playing a different game focusing on drivers in general, and don't have the scale Lyft does)
If they can get traction, they'll have cracked a problem that many people have tried to solve and failed at: how do you get Americans to carpool?
Context: Lyft's founders pivoted into Lyft from Zimride after five years of building white-labeled carpool sites for colleges/companies + a public long-distance carpool/rideshare board, and discovering that a) that's not a VC-scale business, and b) 90% of Americans don't "do" traditional carpooling and they're not about to start
Anyway, I use Lyft over Uber when possible for many reasons, but this is one-- they started out trying to improve society in a particular way, and still are, even as they've changed their approach. And I think they should be commended for setting an example for how to achieve an activist-y goal through a startup/company. Or since it's not achieved yet, at least trying.
(I have no affiliation with Lyft, see my profile.)