MongoDB recognizes OSI as an authority as well, which is why they submitted their license to OSI for approval. Which led us to this moment, where OSI has not (/yet) granted that approval, and that apparently raised gp's hackles for some reason.
MongoDB recognizes that OSI approval is a nice thing to have as a selling point. I very much doubt that they accept the OSI as an authority that can make binding rules and regulations about who gets to call their software "open source".