There is some 'growing the pie' at the margins, but I'd suggest that Uber Corp. grabs more than what is created, and that drivers et. al. are holding the losing end of the stick.
The power imbalance between Uber Corp. and drivers is quite massive. Esp. without employment status.
Uber is designed to suck every last penny of real margin out of the system, and leave drivers with the absolute minimum.
Worse: because many drivers make short term decisions about their costs, and don't calculate wear and tear into their decisions, it's probably that Uber driving is borderline unprofitable.
Imagine if there was one factory in the world where you could work. You got $10 an hour - just enough to stay alive. But - you are going to get sick and die in 10 years from the toxicity. Well, the real 'market price' for such dangerous work might be $20/hour - enough to pay for health insurance and medicine, but because of short term decisions made by workers who are desperate - it's $10/hour i.e. a 'long term money losing venture' to work in the factory.
I generally like Uber as a concept, but we can't ignore these issues.