At those levels? Not many. And we're talking a company the is not profitable, what Uber is doing in any other market would be called dumping and it's illegal in most of them, and that without beginning with the semi slavery that promotes Uber.
Sorry, but how does that matter?
Just because everyone (theoretically) does it doesn't excuse the behavior.
$224 million was paid for California prop 22. It wasn't all Uber but not many companies at all drop cash like that.