I don't know, but they expend billions of VC dollars subsiding rides to get market share. Maybe they could change strategy and expend the same money lowering their share in the rides. Probably the first strategy worked better for them until now.
They certainly could have had the same success or even better, by taking a 10% vs 25% from the get go. I think it has more to do with the Uber management's vision of what that platform is. This has never been a platform to empower drivers or to right inefficiencies in the transportation business. It has always been a platform to exploit inefficiencies in the system.
