This is a tough question, at least for me. I do maintain a number of pieces of Free software, and have contributed (sometimes significantly) to a number of applications with wide(ish) use.
I once got a kind note once from someone working in the film industry who told me my mtf/bkf tool saved their renders after a particularly nasty blunder involving their cluster and backup servers. I'm sure this probably saved them a quarter-million dollars or more, but none of that savings made it my way.
And outside of that one email, over the last nearly thirty years I've received nothing else but abuse and nit. Forks, sure. Patches, a few. But the overwhelming attitude of the open source community is that I work for free, or fuck you.
Well, fuck you guys right back!
HN isn't unique in believing there's some kind of virtue if you can get one over on your fellow man and make a buck on his or her back. Everyone seems to be like that. And if someone complains about it, it turns personal quick, often attacking the economics as you have: Have I contributed more than I've taken? Has anyone? General criticisms of whataboutism and entitlement notwithstanding, this slippery slope doesn't go anywhere good, and despite how well-meaning your question might have been, the reality is it's never enough. Nobody does anything anymore who hasn't stood on the backs of someone else.
This sucks. It sucks bad that Facebook and Google got me to work for free. And to sell ads, no less. How ashamed am I of that?