Hacker News is a website (so even with their code being open-sourced, I cannot verify what exactly they're running anyway), not software I'm running (JS aside).
The firmware on the routers between me and the server are proprietary, and there is nothing I can do about that.
I can choose not to run proprietary software without having to not use the web.
I avoid it as much as I possibly can. I don't know what more to tell you. I never said I'm proprietary code-free, but just that I avoid it at all costs.
Hell, I've recently been forced to install proprietary code to work with government generated data. Such a mess.