They are actually going down because of inflation and the lack of a full compensation for that. You get the same money but it's worth less.

As for unemployment figures; apparently they are very low right now. Which suggests companies actually need to offer more to be able to fill open vacancies. A few tens of thousands highly employable people leaving the fang companies is not going to change that.

salaries rarely and hardly ever go down. however inflation does exactly that in real terms. This is an interesting article about it: https://www.interfluidity.com/v2/9566.html

Lots of these peoples compensation package is largely equity based. Their pay has already taken a major hit.