If there was a maximum wage law then there would be no danger of poaching.
I would be more concerned if people who picked fruit were being poached with higher pay. We have no one willing to do those jobs.
I have no problem with that. Let them leave.
Suppose we set a maximum compensation cap of $10M/year in the US. So executives can no longer earn more than $10M/year in total compensation (salary, bonus, golden parachute, etc.).
So a bunch of overpaid execs leave the US. Where exactly are they going to go where they'll 1) be paid more than $10M/year, and 2) actually be able to do these super-high-paying executive jobs effectively (i.e., they need to know the local language, etc.)?