There's also another angle. During the call with Lex last week, Dario seemed to imply that future models would run on amazon chips from Annapurna Labs (Amazon's 2015 fabless purchase). Amazon is all about the flywheel + picks and shovels and I, personally, see this as the endgame. Create demand for your hardware to reduce the per unit cost and speed up the dev cycle. Add the AWS interplay and it's a money printing machine.