Open source stuff is great, and I support it and have contributed to projects myself, but people bandy it out as if it's a silver bullet and I have my reservations there. The issue goes way beyond technology itself, it's structural/sociological/cultural and that's not going to be fixed just because there are open source alternatives.

It's not a silver bullet, nothing is, no one said that, but it's the best chance at democratizing technology that we have.

How does contributing to open source software and education help me pay the bills in a world where my job has been automated

It doesn't stop that, but would you prefer a world where you're unemployed and locked out of the technology, or unemployed, and have access to the technology so you can learn and use it for free to maybe get back in the game?

If I'm unemployed what's the difference