I'm one of the authors and totally agree, the challenge is because these companies bootstrap there is very little information about them. A lot of what we know

I'm one of the authors and totally agree, the challenge is because these companies bootstrap there is very little information about them. A lot of what we know about VC-backed companies comes from SEC filings, so by remaining closely held a lot of the useful context remains invisible. That said, we're going to keep this story updated and will try to uncover more information.