Honestly, it's never occurred to me to keep a catalog of names & posts so that I could one day answer this exact question. And a lot of people that I might cite if I had time to spend hours trawling through the HN comment history might not self-identify as "anti-capitalist" or "leftist", or "socialist" or anything else.
That said, I absolutely feel like you see a lot more comments these days, that are generally negative towards capitalism and the libertarian mindset, compared to a few years ago. Look at almost any post mentioning Uber or AirBnB for example, and it will be filled with people saying "Uber made a business model out of breaking the law for profit" or "AirBnB should be more heavily regulated than they are", and so on and so on. And the comments that say things like "well, this is what you get with late stage capitalism", yadda, yadda... it all seems a lot more prevalent than in the past.
And, hey...I'm not even going to say that some of it hasn't been earned. Big tech companies have made more than a few decisions that have brought them a lot of enmity, and they should have known that would happen.
And getting away from the capitalism point, it seems to me that in these days it's much more likely that a post which comes off as "pro gun" or "anti taxation" will be quickly down-voted into oblivion.
Anyway, it's interesting that two different people can see the shift (if there is such a thing) in the HN zeitgeist so completely differently. I'm not sure what that tells us...