Where Tesla is the darling of the tech world, Uber is facing legal challenges around the globe. In the last month, the ride-sharing service has faced a new spat of restrictions, protests, and even violence in cities in the US, France, Mexico, Brazil, and South Africa. The action against Uber stems from taxi drivers who argue their livelihoods are threatened by Uber's cheap rides and easy-to-use hailing app. Though still some years away, self-driving cars could put such drivers out of business permanently, with or without Uber.