You have misinterpreted that particular bit of economic wisdom.
"Anything that people will do, they can be paid to do." This means that, if people are already doing something, then it is possible to form a market by compensating them and claiming that the compensation is due to what they have done. However, it does not mean that things which you intend to do will be compensated.
It's painful to listen to the same tired anti-Free Software arguments. You feel that money is a reasonable yardstick for value, but if it were, then most commercial software would be given away, since software is merely information (a collection of bits) and information markets always have a degenerate behavior where the value of any particular piece of information tends towards zero as the number of people who know it climbs. (Formally, these markets have the quirk that every purchaser becomes a seller, causing the market to spiral into a degenerate shape.) Indeed, SaaS embodies this economic lesson.
Worse, you've confused giving away Free Software with giving away hours of labor to startups. These are very different situations, and I think that you know it, but by confusing them, you get to claim that FSF and GNOME are as exploitative as Y Combinator. To give you a clue, one side backs Free Software, and the other side doesn't.
Hearing a cultist of finance decry the cult of Free Software is pretty cute. Of course you're gonna be uncomfortable with our model and the fact that it gets shit done. Either loosen your mind or continue to be uncomfortable.
The things you've said have negative value. Indeed, you are not helping the situation personally. As a result, I'd like to invoice you.
Ending thought: Isn't almost all software actually shit? Why do you think that it has value?