Earlier quoted context omitted.
>What happened to Quora anyway? It became marketing. Almost every question turns into blatant and unhelpful pitches for the responder's startup. Same with Medium. Once the startup bros say a site is good for "native marketing", that's when the begins to die.
makes me wonder how HN manages to maintain sanity in such a world
HN has indirect benefits to YC, so it gets hosted and maintained. In that model, ensuring authenticity and freedom from advertising cancer works for the benefit of both the community and YC.