Well they should because it’s totally illegal under US law to do that.
https://www.breitbart.com/politics/2019/02/26/doj-fines-virginia-firm-h-1b-workers/?fbclid=IwAR0AyPHGebAOYpr59DXKRPjkgo2b7BhYWzXLoNTcQ1rTSQh1DChjvDSAqTk
The Department of Justice (DOJ) is fining a Charlottesville,
Virginia, firm hundreds of thousands of dollars for hiring foreign
workers on H-1B visas instead of qualified Americans in its latest
settlement, thanks to former Attorney General Jeff Sessions’ Protecting
U.S. Workers Initiative.