Uber is very convenient, of that there is no doubt. But as an investment....erm...
My problem is, why would I get into an arrangement where I own almost all the liabilities. Car(depreciating asset), fuel, insurance, service(recurrent expenses) maybe a loan(interest).
Even if I am getting a bigger chunk of the revenue, I am also bearing the weight of not only more costs but the costs with greatest variability.
The crowd will cheer your coronation as well as your beheading. People like a show, that's all.