is there much truth to these patterns? I've never worked for FAANG so am unaware of their structures.
Dunno how it is now though.
It created extremely perverse incentives where nobody wanted to help each other or would even go as far as to sabotage other people's work in order to make sure they're not on the bottom. Some managers would hire people with the intent to fire them later.
In the period where Steve Jobs was not CEO it was a lot more like Microsoft with the various geographical divisions e.g. EMEA, AMR in particular having their own fiefdoms and starting wars with each other. And then of course the ridiculous number of skunkworks projects that would compete with other teams.