Employers behave as adversaries to their workers anyway, comparatively wealthy and powerful adversaries. So either you union-up and present yourselves as a united and somewhat formidable adversary, or you don't and remain a (relatively poor and powerless) individual, no match against your (already existing) adversary.
A good chunk of the readership here is in the https://en.wikipedia.org/wiki/Labor_aristocracy and have their incentives firmly aligned with their employers thanks to superb pay and equity grants. Poor? Powerless? Certainly not them.
Yeah, right up until the point where you get sucked into a massive layoff right as your company is posting record profits and boasting how much code is written with AI now.
I think a lot of people in tech are realizing how helpful unions could be right now.
