I don't understand your argument that the software is being supported by SF and Github. Github and SF didn't spend a cent to develop any of those projects; they were created and then hosted there. If I hosted my open source software on my Linode account would you say that it's paid because I spent my own money to pay for Linode?

You picked one example in which someone gets paid to write software, but there are hundreds of thousands of software projects that were written in people's spare time, either for fun or to learn to code or to scratch their own (non-monetary) itch.

Here's a random one from the HN frontpage last week:

https://github.com/holman/spark

I'm not sure whether we're arguing some kind of objectivist semantics game, or if we're talking past each other.