Uber could always find more people to drive cars though - it’s not a rare skill. It’s also the reason you don’t see a lot of fast food unions. If you can train a new employee in a week there’s a limit to the (union) demands it makes sense to comply with. Union shop grocery stores are one exception: a rare holdout of an earlier era.
But anyway, even though Uber might lose some sales in the short term while they build up more drivers, if the union’s demands would make the rides barely profitable (or where Uber loses money) then that’s not really an actual loss.
Not to mention it’s the drivers who still pay depreciation and insurance cost of their cars whether or not they drive.
Similar to another commenter I don’t really care or have a dog in this race, I’m just commenting on the actors and what their relative advantages are.