I knew a guy at a FAANG who earned himself and his report a PIP for the grave sin of choosing the wrong deputy to send upstairs while he was on vacation. The deputized person went to one meeting and ran his mouth (arguably, told the truth). Both are no longer at the company.
PIP politics are absolutely routine in FAANG and if you’re arguing the other side you don’t know. FAANG is actively trying to fire or replace you at all times. I’ve worked at two so I can’t speak for three, but I’ve also worked for the two in that older acronym that you’d think of as the “nicest”. People read that that and probably hear me saying “giant evil entity is out to get you”, but it’s really middle managers cosplaying Kings Landing in the office, mostly unchecked, that does it.
Seriously; people want to work at a FAANG/MAMAA or whatever so they often assume it’s good. I had someone ask me if I noticed how light my calendar was now that the org considered me irrelevant. There’s an idea that FAANG is a bunch of nerds with glasses cooking up cool shit in a Zen commune with ambient drone music but it’s honestly some of the worst office politics I’ve ever seen across what is now two careers, and the PIP process is a big tool in that kit.