You're responsible for the technology you create.

So if I create a knife I'm responsible if someone uses it for murder?

Maybe I should implement a camera on the knife that records your kitchen 24/7 to make sure the knife wont be used for murder, is that OK with you?

Unionize workers in Microsoft.

If you "unionize" microsoft and keep windows non-free software, the employees get better wages, apart from that the users still get spied upon, and the means of production (windows source code) still under ownership of a small group of people, (and just like any other operating system or knife, can) still used for nefarious purposes.

Even if the workers at the microsoft commune decide to made windows non-spyware anymore, there is still no way to actually be sure since there's no way to verify it.

Also, proprietary software isn't only a prime example of private ownership of the means of production, but also a prime example of artificial scarcity.

As long as it's "Free Software" instead of "Free people" you're playing on the side of the tech oligarchy.

Free software is a requirement for free people, if you don't understand that, then you really have no understanding of how technology works, of how people work and how freedom works.

I recommend reading the following article: https://www.gnu.org/philosophy/free-software-even-more-important.html