My wife has worked the same job in and out of unions. She didn't want a union, it was a drawback for her. Her union job seems okay. Some things are better, some are worse. They've got some absolutely asinine policies that everyone hates that don't change and haven't changed for a decade or more despite the union "power".
Also, her job requires a masters, soon to be a Ph.D, and still pays less than most of tech (though it pays very well).
And of course because PART of the industry is unionized, it is impossible to say to what extent non-union jobs are free-riding on the "benefits" of a union.
That's an interesting assertion that you seem to be accepting as universally axiomatic.
(... or perhaps, a self-referential definition. Maybe a company isn't "massive" until one observes behaviors that suggest the company is purposefully acting counter to employee quality-of-life wishes?)