To be honest, it feels like Github is a big social experiment (or game) masquerading as a company. I feel like going to work there would be to implicitly agree

To be honest, it feels like Github is a big social experiment (or game) masquerading as a company. I feel like going to work there would be to implicitly agree to be part of those experiments, and that -- exactly as you mention -- it would be hard to discover the rules of the game and even harder to continually abide by them while maintaining any sort of sense of individuality. I interview for fun in my spare time, and every once in a while I am invited to interview at a company that breeds a Borg-like hivemind which seems to consume all traces of individuality for whatever reason (usually I think this boils down to a volatile management environment). Google is one of those companies. Whisper (the "anonymous" social network) is another. And Github feels like it would easily reign supreme in that respect. I would not feel comfortable being myself in that environment for fear of breaking these unknowable boundaries, and it would affect my work.