Alongside the Microsoft-cofounder-turned-philanthropist and the Amazon CEO, there is an array of top investors and industry leaders backing it — including Virgin's Richard Branson, Bridgewater Associate's Ray Dalio, John Doerr from Kleiner Perkins, LinkedIn cofounder Reid Hoffman, Vinod Khosla of Khosla Ventures, Alibaba exec chairman Jack Ma, Facebook cofounder-turned-investor Dustin Moskovitz, and Softbank CEO Masayoshi Son.