If you really look at Ubers business model then you will realise this would never work for punting
A bunch of investors came together with a war chest of a couple billion $, prepared to run at a loss for a few years. Set up Uber and initially pay the drivers more than basic taxi drivers wage, while not charging the taxi riding public as much a normal taxis. After a year or two they entice as many drivers as possible to buy new cars with Uber loans, and deduct the loan payments from the drivers earnings. Then once a high enough % of a cities drivers are involved they drop the drivers earnings, forcing the drivers to work 60-80h a week to earn what they used to earn in 40h, but because they are tied with the Uber loan, they can't back out
The early Uber cities like Detroit and San Francisco are well down this timeline with a load of disgruntled drivers
On a small scale Sergei does alright out of pimping, but can't see Uberpimp working on a global scale. Can't see a way to get the WGs to be tied to the app for any reason and be forced to work like Uber drivers with the Uber loans are.
And thats before you think of all the privacy concerns surrounding punting