Uber is doing huge business in Mexico City, to the point where they feel comfortable using drones to taunt people who aren't using their service yet.
A recent ad stunt for UberPOOL saw the company fly drones over gridlocked traffic. The drones carried signs saying things like "Driving by yourself?" and "This is why you can never see the volcanoes." That last one only makes sense if you know how polluted Mexico City is.
The point is to guilt the reader into carpooling with the UberPOOL. (That won't get you anywhere faster, of course. In fact, you might wait just a little longer for your ride.)