If they are a marketplace where the drivers are independent entities from Uber, then the money going to the drivers is not considered revenue under GAAP. Which is why I ask whether or not the drivers are Uber employees or not. I have no idea if they are or not. If they are Uber employees, then it is legitimate revenue, but if there is some agreement where they remain independent from Uber, then it would not, under GAAP.
Think about a site like Expedia, or Orbitz. They do not claim the entire price of the ticket as their revenue, since that money is going directly to the airlines. Their only revenue is the $10 they make from a ticket purchase.
This is the same issue that Groupon ran into pre-IPO where they were claiming the entire deal as their revenue.