On top of that, politically active tech workers are most often either leftists who feel like what you said, or libertarians who believe in meritocracy

We actually have a few unions for tech where I live, but they are run by pmc:s and don't really have to do anything since employers are willing to pay above the unions' recommended salaries, so they mostly just sit on their asses and slightly raise the recommendations every few years and don't bother with any kind of solidary actions for other unions. I won't join any of them until they are willing to strike for someone else's benefit (or I'll just strike illegally, fuck pmc)