I've yet to see that once.
Not the H1Bs at Amazon who were paid less and guilted into working weekends. Not my Mexican girlfriend who works for $50k as an oil rig chemical engineer in Houston at a company that only hires visa workers on the cheap. Not my Indian neighbors I befriended making $60k in software at Chase bank in Houston on their all-visa teams.
SLB is a good example, where I met my girlfriend. Entry level American chemical engineer: $120-150k. Visa chemical engineer imported to work on the same team in the same position: $50k. Guess which part of the pie chart grew while I worked there.
But I'm not supposed to notice any of this. And until very, very recently it was a faux pas to mention it at all.
Yeah, nobody is supposed to mention it at all. It's just a race to the bottom, though. Good news: The bottom approaches.
your personal anecdotes doesnt negate the actual data
If we're going to give anecdotal data, when I lived in NYC I was hired as an H1B, and every single other H1B I knew was paid way more than the median wage. But these were companies not trying to abuse the system. I do not doubt that there are bad actors.
I do agree that there should be minima to prevent abuse. I do not agree that every H1B hire was to abuse the system.
In the early 2010s there were hiring shortages, the startup that hired me would have probably preferred saving on the attorney fees and the 6+ months it took between the offer and the start date. For a new H1B you have to prepare the paperwork in March at the latest, apply the first week of April, for a start date of October 1st. And not only that, but with the quotas and the lottery you're absolutely not guaranteed that your hire is going to make it. All things being equal without a shortage or the ability to underpay, it is not an attractive solution.
H1Bs do push salaries down, because there is more "supply" of workers, so it should probably only be used for hiring for areas with shortages, but even then you can have downturn like what we're having in tech, and some companies may keep their H1Bs over FTE because they are less of a flight risk and can't negotiate their salaries as well. Even with a shortage, this means that employees with that specific skill will be paid less, now it's more of a matter of which one is better for the economy/society.