Earlier quoted context omitted.
It doesn't help that the best engineers work for GAFA because of big salaries. European companies pay smaller salaries compared to the US ones. A good engineer can double his salary by going to the US. Sure, he may see more social issues there because of no safety net, but maybe he doesn't care.
Salaries are irrelevant since it's close to impossible for an European worker to move to the US, work visas are incredibly difficult to get and even if you manage to get one you don't have the same careers prospects as a native. edited: reworded to "close to impossible"
I know plenty who did. You should rather say something like it's hard for the average European worker to move to the US.