> Jeebus man. What is it that you FAANG developers do that is so much more complex than what regular developers do?
Nothing, for nearly all of them. Hell, half the time they're not even particularly impressive at executing on the totally-ordinary things they do. The companies just have firehoses that spit out money so can afford to spend more on developers, and choose to do so for a variety of reasons, most of which have nothing to do with how challenging most of the work actually is.
One reason (of several): insanely high comp means everyone (more or less) wants at least some time in a FAANG(-alike) job to bank some money. The flip side is that their hiring process is hellish. Put those together and you have high motivation for people to apply from one side, and a strong disincentive for anyone who's got any amount of doubt in their ability to pass the interview, any reluctance to put in the time to prep for them, or low bullshit-tolerance, or whatever. The result is that practically their entire candidate pool would be good hires (=good enough at the actual job, and willing to jump through hoops), so they don't have to bother figuring out how to spot good (for their purposes) developers, they just keep comp high and interviews unpleasant and time-consuming, and it all sorts itself out.
Combine that with several companies all in similar situations trying to do the same thing, and you get what you see before you WRT developer compensation in a narrow slice of the industry. Except when they collude to keep wages down, which they have done and (speculation) almost certainly are still doing in less-obvious ways.
[EDIT] Just to be clear, some of the work they do is Actually Hard, but that's not unique to FAANG (though it probably is more common there than, say, at your average Web agency or whatever). More of it's not especially hard but is hard to get experience with outside of FAANG (scale-related and fine-tuning stuff mostly, some of which is hard but much of which isn't more difficult than most other development or ops stuff, just different)