Some of this may be jobs with exotic requirements, especially where they want the new hire to have experience, not just schooling, in some key areas.
Some of this may be the same old same old B.S. where the idea is to bring in a foreign national, or outsource, on the cheap but first to “show” that no US resident can fill the post.
Pay me health insurance coverage and minimum wage and I'll take it!
In 41 years of working I have NEVER been unemployed and NEVER accepted a dime of help without giving reasonable return for the cost.
Perfect health and a lifer citizen and a 40,000 post freeper! ; )