I imagine there would be plenty of folks willing to come over if the wages at least got into the ballpark of the US. My impression is that the visa/residency process isn’t too onerous if you’re coming over with a job. Close the gap enough and it’s worth it for many, with quality of life stuff taking up the slack. But it can’t be too large, because tech workers can afford quality of life in the US too - it’s just purchased a la carte with the higher salary.