It's a trade: y-combinator, by cultivating a group of talented technical contributors, gets to advertise hiring posts for free and, in some ways, autistically contributes to the community.
In exchange, we all get a place for thoughtful discussion with reasonably fair moderation.
It's a fair trade for those involved and closer to a non-profit model than Reddit which is clearly trying to extract as much value as possible from the content creators on their platform in exchange for giving them community/platform.
How do you know? Just because there is no ads doesn't mean they don't have any benefits from keeping HN thriving.
Also for me I like HN because of the content, not because I care about YC's motive. You are obviously different.
Should we tell him?