Game devs are hardest hit by bad conditions, but every worker in every company would benefit from collective negotiation -- use your imagination, you could have a much higher salary, more flexibility in your workplace, more autonomy, you name it. That's what unions do, they let you bargain for the things you can't as an individual.

Lamentably, there's still a lot of folks in the software field who see themselves as the rock star, rather than the rank and file.

Also lamentably, there's still a lot of perception that a union means: you can't fire dead weight (you can, you just have to follow a process), pay is based on seniority (doesn't have to be, but what's wrong with that anyway? we don't have a good way to measure productivity or value, so what other metric should we use?), that they're corrupt (they're democratic institutions, so they're as corrupt as the members make them), etc.

All of it anti-union propaganda that's been working pretty well for the last 40 years.

In that case you could view union membership as insurance, in case you ever lose that great job. Keep in mind that your local pipefitters union is not the only model out there - SAG-AFTRA seems to work for actors/actresses across a broad range of income, experience, and talent levels.