The H1-B program allows a large number of people into the US, and frankly they vary a ton in how 'skilled' they are. Some are super-smart, some are mediocre, some are just bad. This really confounds the human tendency to make simplistic snap judgements about things.

From my experience, the best H1-Bs go to the FAANGs (or whatever we're calling them these days). The middle of the pack go to consulting companies like Accenture or Wipro. And the subpar ones are C2C consultants for dodgy sweatshops, the kind who fill our inboxes with their 'hotlists' (if you know then you know). While most of them got a STEM Master's here in the US, if you look at the resumes of the weaker ones it's generally from some college you've literally never heard of- Northern North Dakota State or something. I would imagine that they're basically running a borderline diploma mill that's profiting off of foreign families who hope their child will get a Green Card