Mojo was also less ambitious in a lot of ways. It blows my mind the Eve and Darklang guys raised so much money without a lot of momentum. I'd think you'd go the other way, start an Open Source project, spend 10+ years gaining a community and refining it, then raise money.
In both of the above cases, the founders just got bored of their project before they found PMF.
In both of the above cases, the founders just got bored of their project before they found PMF.