That's not accurate though, is it? Unless you're exaggerating for effect.
I don't think most people on HN are against non-free products at all. I think they're against products that provide little value compared to their price.
There may also be some general exhaustion from so many products moving to a subscription model, instead of an old-fashioned one-off purchase. $9/month may not seem a lot, but it quickly adds up.
Sure there are zealots on both sides and they always tend to be the loudest voices in the room but over all, I find that premium products offering value and not just rebranding otherwise free products are met with positivity.
I think it's interesting how the same thing can appear so different, depending on who is looking.
Non-free (as in freedom) software is not something that any self-respecting programmer would willfully associate with because it's inherently dirty. A proprietary license is (literally) a form of DRM. It's a feature that is hostile towards its users, especially those who are "makers" or "doers."