Europe remains fairly isolated from this effect because (a) not enough EU coders want to move to the US even at triple the salary to cause a shortage of coders there and (b) FAANG and US firms can get away with paying less in Europe because remote work is not yet quite equivalent to being on-prem in the US...
Why don't German developers move to SF or London? Some do, but then they're not software developers in Germany...
Why don't SF and London companies hire Germans to work remotely? Some are willing to - but they're also willing to hire Polish and Bulgarian developers, so the market rate isn't that great.
The work of a few engineers can support a workflow of a million users.
That spending $1 on engineering can bring in $10 of revenue.
And they probably want to deal only with engineers from the U.S. for legal reasons.
And up until recently, they’ve only hired in the Valley.
Finding qualified distributed system engineers with that funnel would definitely reduce the pool to several thousands.
Why wouldn't they be? US companies that drive up the salaries are extremely profitable and they compete for limited pool of engineers.
ionised then?