If I offer you less than market value and a reduced benefits package because you know I’ll just hire an illegal or an H1B, then replace you after I make you train your replacement, then you tell me.
Actually I did for a while when I was younger. I saw first hand what greed and market manipulation does to labor markets. Later, I saw what it did to the white collar market.
The fab shop I worked in was not offering lower than market value and if you were proficient and showed up for work everyday your job was secure. The pay at that shop was the same for all classes or skill of workers. If you could weld mig, tig and stick without rejections because of flaws you got top wages, because you were valued, period. This was a high volume shop, I averaged about 25 fits a shift for my three welders, the same as the other 6 fitters on that shift. It was quite difficult to keep all the welder and fitter positions filled, and it wasn’t because of pay, just couldn’t find enough qualified labor.