To borrow from the Harry Potter universe, early stage startups need Gryffindors and Ravenclaws, but then as the company grows more and more Hufflepuffs get hired, and sooner or later the company ends up on the radar of Slytherins, who are focused mostly on obtaining fame and renown, and who are more likely to have what muggles call "dark triad" personality traits.

What's most fascinating about the Hogwarts metaphor is that members of each house each bring some useful value, but the core values of each are often in conflict with the core values of the others.

At some point Mozilla went from being a heroic struggle that appealed to people who had a specific vision for the future of the internet, and turned into a status symbol like having Harvard on your résumé. This happens to any successful startup. A company that would never have appealed to a lot of workers suddenly becomes desirable (all else being equal) because of the status associated with it. Not to bash MBAs, but this is why I advise a "absolutely no MBAs" policy for startups.

MBA diplomas are simply status symbols and most people who have the degree joke about how easy it was to obtain and how much partying/networking they did while in school. They also graduate expecting to be placed in a leadership role due to the degree, even though young MBAs typically have little to no actual work experience or hard skills. I've seen overly confident MBAs nearly sink funding rounds for startups because they thought they were being clever with accounting and the investors saw right through it.