Having worked at Google there wasn't any anti-unuon propaganda or anything: it was just genuinely the best work environment I'd ever experienced... Right up until they laid me off.
So while I was there the thought of joining a union would have been "meh - what can they realistically get me?" and after the layoff was "oh yeah right they could've gotten me protection"
To be fair to my naive past self: it was the first mass layoff at Google, ever.
Based on my friends still there: the vibes are decidedly less trusting all around.