Actually, we moderate HN less, not more, when YC or a YC startup is involved, even though (or rather because) it's the cheapest trick in the book to accuse us of otherwise. However, that doesn't mean we don't moderate at all. A generic ideological "yay markets" vs. "yay unions" tangent discussion quickly becomes predictable, tedious, and off topic. Marking it such has nothing particular to do with YC or Instacart.
It's trivial to verify that this is standard HN moderation:
Edit: Oh, YC backed Instacart. Got it :)