Sorry to disappoint. But despite the rare exception here and there most open source development is either paid or quickly forgotten. If I put into google "Linus Torvalds income" the first sentence reads:
"Finnish-American software engineer and hacker Linus Torvalds has as estimated net worth of $150 million and an estimated annual salary of $10 million"
lol, it's true that most development in open source is paid. It's really easy to experience. Just work anywhere where people develop open source or make heavy use of it. But it's really hard to proof to someone who hasn't experienced it since nearly every example and statistic can be doubted. So doubt as much as you want. But if you think there's something worth learning out there, try to experience it and you'll see it's >90% paid work.
It is clear that you have no clue. Probably you think that the existence of "foundations" means that money arrives at the people doing the actual work.
I on the other hand work on a very large open source project.
If every open source project was developed by those principles, all high and mighty web companies would collapse.
Good work is being done, but it's for free.
EDIT: You're right of course about the reality in the parasitic companies.