BERLIN, GERMANY - JUNE 11:  Taxi drivers, including one with signs demanding the prohibition of the Uber app service, gather next to the Olympia Stadium to protest ride-sharing apps on June 11, 2014 in Berlin, Germany. Hundreds of taxi drivers arrived to demonstrate in a protest that coincided with similar protests in cities across Europe against new apps like Wundercar and Uber that the taxi drivers claim are undermining their livelihood and creating unfair competition.  (Photo by Sean Gallup/Getty Images)