DHS creates fake university, arrests foreign students for attending
usatoday.com
usatoday.com
It's not like students on F1 Visa know what is legal and what isn't, especially with US immigration laws being so complex. They usually rely on the grad school Visa office to tell them if they're allowed to do something like where they can work and what paperwork needs to be filed.
Instead of doing the actual work of publishing clear rules, explaining the law, inspecting universities and ensuring compliance, DHS ruined students lives after they took their money.
That said, I think the people who signed up should have suspected a fake university given there were no actual classes. These people were probably merely looking to maintain legal immigration status without actually doing the needful work.