20VC: The Opendoor Memo: Keith Rabois on The Origins of Opendoor from a Conversation with Peter Thiel, Why Cash is Not a Competitive Moat for Startups Today and What People Misunderstand About Black Swan Events in Real Estate and How it Impacts Opendoor | The Twenty Minute VC (20VC): Venture Capital | Startup Funding | The Pitch | Podwise