On a more general note, I enjoy reading these post-mortems. Not out of a wry malicious pleasure, but it is certainly a learning experience.

Is there some place where these are gathered for common benefit? Maybe get into more depth with interviews, because this post-mortem for instance leaves a lot of questions unanswered.

The top Google link is a CBinsights blog post, but that does not really cover it. I would consider starting this as a side-project. Would this be interesting?