I thought maybe it was some regulatory/gaming license sorta deal. But I'm looking at job listings for things like working on casino ATMs, repairing slot machine

I thought maybe it was some regulatory/gaming license sorta deal. But I'm looking at job listings for things like working on casino ATMs, repairing slot machines, and even a job listing for Revenue Auditor where the job description covers auditing slot machine drops, annual casino revenue, etc. None of these have US Citizen as a requirement. Seems very suspect, honestly. But I dunno how these things work on casinos.