The main protest here seems to be that fixing what unions break inevitably benefits capitalists while cheating the worker. I'd genuinely like to know: what's the best example of an industry disrupted in this way that left workers net behind?

Everyone knows it's annoying to see the rich philosophize in armchairs while the rest of the world does the lifting. Is that all that's left to say? pg seems to be claiming that (a) unions indicate breakage for startups to fix, and that (b) fixing this breakage is in fact more profitable for startups if they do it good-naturedly instead of simply taking workers' pie. Is this false?