As the battle for the world’s ride-hailing customers heats up, here’s one statistic to consider: Uber is now the most used taxi app in 108 countries.That’s according to analytics provider SimilarWeb, which tracked the reach and usage of ride-hailing apps in 171 countries on Android devices. The map below shows that Uber, indicated in dark blue, is the most dominant player in broad swaths of the globe, including all of North America and much of…