Yeah, on the H1B there seems to be a separate issue. Posting a job listing that is intentionally hidden or otherwise not going to get bites. That way a company can say that they couldn't find a candidate and have to hire someone in need of a visa. From what I understand they do this to undermine wages as well as having a ̶e̶m̶p̶l̶o̶y̶e̶e hostage who won't complain about poor conditions because they don't want to lose their visa.