That said, the number of companies I would be willing to jump ship to from my current job (despite my gripes about it) is not that large. Certainly more than FAANG, but I'd say < 100.
Forgive me for the observation but it seems to me you've put big name companies on a pedestal as though they are objectively better jobs and maybe have some blinders on in terms of the real scope of opportunity that is out there.
And if it's about pay, smaller companies can often pay well too.
Except maybe for Uber, all those companies they listed failing at are objectively better at attracting attention to your resume than some no name, smaller company nobody's heard of.
Not just pay of course, although I'd be lying if it wasn't a factor at all. I'd be willing to jump ship for the same (or even less) pay if other characteristics of the new company made it worthwhile.
I'm aware things aren't perfect rainbows and unicorns there (or really, at any company). But the friends and excoworkers who've gotten into FAANG, and similar companies, absolutely love it. And not just for the pay.
And most of the smaller ones, while less prestigious, are probably just straight up better places to work.