Well, you choosing to donate your time and effort to an open source project is really not analogous to a union's work improving workplaces, but! As it so happens I do believe that having huge swathes of the tech industry built on unpaid labor is also a pretty bad thing, that the political stance taken by large parts of the FOSS community that "free means no restrictions, EVER!" is foolish, and that companies should have to pay for their use of FOSS. It enables exploitation of individual maintainers by massive corporations.

And to loop back around to the topic most of us are discussing, if there were some type of SWE Guild, standardizing rules around FOSS usage and remuneration for FOSS creators and maintainers should be high on that guild's list of priorities. There're thousands of people in the entertainment industry making comfortable livings off a combination of some work and residuals; why can't that be us? Why shouldn't people who've created, maintained, and improved projects that companies have leveraged for billions of dollars of profit see some of that money?