Uh, they seem to find that money just fine for execs, who are not even the ones keeping servers up, so to speak...
It doesn't mean they did 10x the work, but they definitely brought the value.
People literally jump around chasing pay increases. If you got a decent raise comparable to a job change would you jump around every couple years?
Just how many 20 year experience engineers do you think the average company has?
I have a feeling you will find that the (very small number of) folks who have been at the same FAANG continuously for the past 20 years are indeed making compensation in that ballpark (we're talking Google's Senior Staff Engineer or Amazon's Distinguished Engineer level) - particularly if you take into account the massive stock price increases over that period.
Can’t be that hard if an engineer can just walk out and get that. What do you think the replacement will cost? And with none of the knowledge.