It's not problematic at all. But it would require Uber to cease being a software company and start being, like, an actual taxi service, with physical assets and vehicles and garages and maintenance. The whole reason Uber is competitive with actual taxi services is that those costs are all offloaded to the poor saps who drive for them.

That sort of thing is outsourcable... Just work with a manufacturer or a car rental company, they'd do the maintenance, and Uber would do the stolen, allegedly, software.

Uber no longer passes the depreciating asset liability on to vehicle owners

But they also don't have to pay the drivers at all. It's a pivot from making the drivers foot the bill but its not obviously untenable as a business model. I think the part that should raise eyebrows is Uber's claim they can actually build the cars before they run out of money.

They will have to change their entire organization, structure and how they do business, to accommodate this. It's as "easy" as copying Apple's vertically integrated model - many have tried...