It's not clear that Uber or Lyft are net positives to society. They are disruptive, but not necessarily in a good way.
Yes, they provided $8B worth of rides. But before that people still got around. What the world might have been like without Lyft is impossible to know, but the way it's changed the job landscape isn't exactly a huge net positive. It's put a lot of cars on the road and it's set to new "floor" for jobs in general. Uber, Lyft, Taskrabbit, DoorDash have created a new kind of serfdom.
I'm not saying it's a bad thing, necessarily, but I wouldn't say that they didn't hurt anyone. They definitely hurt social progress.