Point taken.
Pre-pandemic, our employment system favored the employer. Now with jobs un filled and low unemployment, that may change to favor the worker, something I'm all in favor of, and maybe the resurrection of unions.
Maybe it is the pay level, but I read a few years ago about an orchard in California that hired college students. Typically, they would work one day and quit.
To be clear, I favor a path to citizenship for migrants. And good wages. If they work to improve our economy, they deserve to be citizens. Otherwise, it is slavery as you describe.