Wouldn't an app be relatively easy for Uber to monitor and subvert?
Drivers are already sometimes coordinating to create surge pricing, and they don't need an app to do it: https://www.inc.com/minda-zetlin/uber-lyft-drivers-artificia...:
> While a reporter looked on, a group of about 50 drivers for both Lyft and Uber sat at their waiting area at Reagan National waiting while two drivers watched online to see when planes were about to land. After a plane lands, a lot of passengers request rideshare rides, which pushes demand up to begin with. But the drivers further tipped the imbalance between demand and supply by simultaneously turning off their apps five minutes before landing. Then two drivers stood at opposite ends of the waiting area, looking at the Uber and Lyft pricing for fares from the airport. They kept checking fares and watching the surge price increase until the fares were $13 higher than normal. At that point, they told the other drivers to turn their apps back on so they could begin accepting rides. The whole operation took less than two minutes, but now arriving passengers would pay around $13 more to reach their destinations.