Haven't finished your book yet (excellent work though!), but I've noticed that some of the startups interviewed no longer exist (Djangy and Blippy, specifically

Haven't finished your book yet (excellent work though!), but I've noticed that some of the startups interviewed no longer exist (Djangy and Blippy, specifically). Were there any indications during the interviews that the startups were going to tank? I'm asking because in your interviews, everything sounded fine. Then again, appearance can be deceiving.