Disappointment in the HN community has reached a new high today.
So, instead of discussing the topics in the video, the majority of commenters here are discussing the flaws of the website it's hosted on or debating whether or not reddit is profitable. Neither of which has ANYTHING to do with scaling.
The dominance of non-relevance is interesting for HN. Was writing exact the same thing, and just saw yours.
In this and some other technical topics, people end up discussing their personal tastes with web site's design, their individual UI frustrations with some button on the web site, the font, the color, and other random non-relevant topic; like now the profitability.
It's no excuse, but I see a reason for this: most people feel they understand these irrelevant topics better than they understand the scalability features of the infrastructure Reddit has built. People talk about their comfort zone.