As an aside, I’ve seen this happen elsewhere as well. Classic play for wage theft. When I was working as a bartender in London to make ends meet, I had a coworker from Mexico on an expired visa. Great guy and the most hardworking. Well won’t you guess it, guy got picked up by immigration authority on payday.
I appreciate your insight here. It has some relevance to where I am in the UK, where international workers are holding up the NHS. (This is one of many reasons why Brexit was a disaster)