Earlier quoted context omitted.
In 3 years in the US you earn significantly more than in 5 years in France, so the vacation and health coverage arguments do not hold, unless you have an expensive illness (>30k$ per year). The job security on the other hand is very real, so if you want to coast at your job, europe is the way to go.
There is absolutely no way to get 500k/year from being just an engineer in Europe. I recall the React creator's base salary is 100k/year in London, and he works at Facebook.
Proprietary trading shops in London at the top end or L6+ at Google Zurich can pay that in total comp.
> I recall the React creator's base salary is 100k/year in London, and he works at Facebook.
And what about stocks? There should be at least another 100k in them. Facebook is a publicly tradable company, its RSUs are as good as cash, unlike startup paper money.