First off you might be surprised but money isn't the #1 priority for a lot of people.
In SV maybe, and even then when you factor cost of living, insurances, unemployment benefits, parental leaves &c. I'd rather be in Europe making half the raw salary and getting all the good stuff than being paid twice as much and spending 5k$ on a small flat in SF.
As an outsider it's impressive to see the shift in the recent years, back when I was in uni the majority of my peers wanted to move to the US, me included, and I did for a bit. Nowadays I literally don't know anyone who wants to migrate there in my circles, especially not with the current process. I think American people don't understand how broken their immigration, political and social systems are, and how bad of a deal breaker it is for a lot of Europeans.
- 2 year visa
- Renewable in 2 year blocks if you can prove you've been working or running a business for 18 months earning at least the median income (waived for startups)
- After 8 years eligible to apply for a green card, if an independent panel determines you have positively contributed to the US you are awarded one
This would act as a supercharged vacuum for talent like New York City was for European migrants during the boom.
Especially in tech, you either work in the United States or you are dramatically underpaid. Why not soak up all of the world's talent?