I would probably argue the opposite, given that Y Combinator is a venture capital firm. This would be more true for Lobsters than here.

(Edit: to go further, it's like... ok, if HN is far-left, what does that make Bluesky? What does that make the Fediverse? It feels almost reductive to compress the range of HN onwards down to "far-left".)

Discussion on this site has little to do with Y Combinator. You see people railing against big tech billionaires every day here.

Bluesky is pretty close to being fellow travelers for the userbase here. If you do a comment search for "bluesky" you can see most comments are neutral or positive. HN might be a bit more genteel in how they discuss things, but there are many users here whose politics are pretty similar to what you find on bluesky.