Another poster has a picture of a posting for an H1 job that pays $13/hr for someone with a doctorate in a category for which a) the wage is a joke (even a few years ago postdoc average would be $35k+, I think, currently I think it's low 40s), and b) there's no shortage of Americans (well known glut of available postdocs).
To be fair I legit don't know the details of the fine print. I just know that I see things that don't really make sense to me and seem abusive of the system.
I think that's really all that needs to be said.