Uber is one of the world’s most popular apps, but it's not without controversy. Transport for London announced on Friday that the ride hailing app's private hire licence will not be renewed after 30 September, as Uber "demonstrate[s] a lack of corporate responsibility in relation to a number of issues which have potential public safety and security implications". This is just one of many legal battles, regulatory disagreements and driver strikes that have taken place across the globe, and more than one country has outright banned the leading taxi app.