In no order:
* The business is fundamentally based on ignoring the law.
* They've done nothing but lose money, more than any private company ever.
* The money keeping them afloat is very dirty (mostly from Saudi Arabia)
* The culture is well-known to be awful.
* The drivers are completely exploited, working long days with no security and taking huge financial and physical risk.
* Their headquarters is at one of the most awful corners in the city, which they've done nothing to improve.
And in the end they'll have to start making money. Which means either increasing their prices or increasing their cut. When that day comes we'll realize what we've lost.
But yet, all the people who signed up and coded the app will be millionaires.
Smells like society misallocating value.