Londons black cabs are in a league of their own, so when Hailo, an app specifically designed for those vehicles, announced that it was becoming a fully-featured Uber rival, things got a little heated. In fact, disgruntled drivers have vandalized the companys headquarters and are now rapidly departing the service. The platform has been losing ground to its less-choosy rivals, and so decided to admit that if it couldnt beat Uber, it would probably have to join it.