One obvious loophole is that there a lot of people (SSNs) who haven’t gone to a college already, so the college can just sign up people and get subsidies withou

One obvious loophole is that there a lot of people (SSNs) who haven’t gone to a college already, so the college can just sign up people and get subsidies without those “students” ever showing up. They can pay these students, or possibly fake their documentation.