I can't help but wonder.
They've been posting this job for several months in monthly "Who's hiring" thread (here's one from 227 days ago: https://news.ycombinator.com/item?id=12628215)
I can't imagine that they're hiring 100s of people.
I also assume that people do apply because it's YC.
And yet, the position goes unfilled for months.
Either they have extremely unrealistic standards (a dna-spliced cross-breed of Carmack and Torvalds with business acumen of Steve Jobs) or there's something extremely unappealing about this job (after all it does seem like building CRUD apps in rails; you get to rub shoulders with Greatness Of Other People but there's curious absence of "competitive salary", or any salary, in the job description).