Just because you managed to get a job at Facebook in the past doesn't necessarily mean you can get a job anywhere else now. Tech interviews are very fickle. If people studied for a Facebook interview but don't have the time to do that now due to something like caring for someone then they could be in trouble.
I am not saying its guaranteed that they will find a job but tech unemployment was at all time low and even a mediocre engineer could find a job before corona pretty easily.
If they are so unqualified to find a tech job in boom season then there were plenty of jobs outside tech too.
I don't agree that most of these engineers would never be able to find another job if they quit fb. Maybe a tiny % of protestor, sure.
Your parent poster has a point though -- tech interviews are awfully inconsistent and most people judging you do so based mostly on gut feelings.
You fill questionnaires and do elaborate solutions of rather complex homeworks... only for somebody to judge you by the grey hair in your beard or by you being caught off-guard on only one out of 20-30 questions.
