Thanks for posting your insider's view. I agree their mistakes are not unique, but the scale of the failure and the level of dumbness makes them a much bigger failure than most.

They started in 2013, long after books like "Four Steps to the Epiphany" and "The Lean Startup" explained exactly why scaling up before you have traction is a huge mistake. They could have learned the "this isn't working" lesson for an order of magnitude less money. If they had done that, they a) would have had capital to recover from their early mistakes, and b) would have been much better placed to find that low-cost solution.

When I look at a crater like that, I think about the 50+ seed rounds (or 20 A rounds or whatever) that could have happened but didn't because they got high on their own slide decks. They blew up not because they couldn't have discovered these problems, but because they didn't want to.