Also what about people who have different preferences? You might get lucky and the brave new world of software unions will push for exactly those conditions. Unluckily for me, I have very different preferences.
Why or why not?
Well, FAANG themselves certainly worries they will, they keep firing the organizers.
Why does that only apply when people are trying to dismiss the value of unions or discourage their colleagues from forming a union with their coworkers? Surely if you didn't want to work in a union shop, but a majority of your coworkers did, it'd be on you to just find a new employer.
Though one caveat: that simple analysis only applies for as long as employers are legally allowed to refuse to hire union members.
Then anti-union me can go to some anti-union company. We write in our employment contract that I won't join a union, and that the company will never hire any union members, and we live happily ever after.
You can try to think through the consequences of giving unions various legal privileges. Eg if for example, a company can't legally discriminate against union members in hiring nor fire an established employee who joins a union despite having promised not to, things might be different. Especially if you add in common extra privileges like banning employers from firing striking unions members or if picketing is legalised etc.