Yes, it alters market dynamics and the whole reason it's done is that the same skills are not available domestically for that price (or at all) - but talking about "low-wage labor" and "exploitation" as the whole point of the program is pretty rich.
Rachelbythebay wrote about this in 2018: https://rachelbythebay.com/w/2018/09/08/visa/ if your company decides they don't want you anymore, you have _ten days_ to get a new sponsored job or be out of the country. If you're being bullied or harassed or otherwise treated badly and your employer knows full well they can have you kicked out of the country in under two weeks, would you really speak up?
For an extreme example, see Susan J Fowler's https://www.susanjfowler.com/blog/2017/2/19/reflecting-on-on... . Fowler had the luck to be a US citizen, so she could go public without being deported. (She also says she got another job offer less than a week later.) Would the next person in this situation, but on a H-1B visa be able to do the same?
Since you're apparently so acquainted with the stats, please enlighten us outsiders: what percentage of H-1B employees make $250K a year or more, and what percentage of H-1B employees make $400K+?
https://www.ziprecruiter.com/Salaries/H1B-Salary--in-Califor...
Considering US DOL didn’t count stock comp for prevailing wage (at least last i checked) it would not surprise me if over 50% do in fact clear 250k in total gross comp
You can even search by company and see how much your colleagues make for each job title (no names though)
Strange but true.
Those are real salaries from LCAs, not self reported salaries.
But it is still more credible than self reporting.