I wonder if it's almost like a new version of management consulting. You hire/invest in a bunch of smart 20-somethings who seem generally intelligent with the idea that they'll "disrupt" an industry with their from-first principles approach. Do the 23 year old McKinsey consultants particularly care about their work? No, but the McKinsey name is a fast way to gain clout and access to executives. Ditto the YC name