From levels.fyi, FAANG and the unicorns are almost all in the $300k-$400k range. Have offers gone up $200k in the last few months? Or are you assuming people are moving up a level?
If you filter by "New Offers Only", you'll see a pretty sharp shift in the trend starting around October 2021.
Same with Uber, a notable uptick starting late last year: https://www.levels.fyi/company/Uber/salaries/Software-Engine...
The top of the band has probably gone up more than the median offer, and most companies didn't increase their bands by that much (yet). This is definitely a case of "the future is here - just not evenly distributed yet".