The NY Times has published a smart and useful article on the anatomy of the failure of a startup. Any product manager, or anyone working in a startup, can learn from the detailed sequence of steps that it took to kill Vine (that link will not work once they take the site down for good).
Vine is/was a well-executed app that was early in the game with video sharing, had clever ideas that suited the market, had good backing, had been acquired by a powerful player—and yet it died an unfair death, at least in startup terms. There were many moments of #fail that occurred, not in product design but in lots of other ways, except bad timing. Think of them as checklist for what to watch out for. The article offers a real example of how tenuous a startup can be, and how a cascade of errors can kill even a healthy tech company.