I'd hate to be "forced" to return to my home country, but why can't these students just study online back in their own country, then come back for in-person cla

I'd hate to be "forced" to return to my home country, but why can't these students just study online back in their own country, then come back for in-person classes sometime next year once covid is under control? The reason for excluding all-online classes is that historically it's been associated with much greater immigration fraud. If this really becomes a big issue for students, it's pretty trivial for the universities to turn their online classes into "hybrid" classes that require people to physically come to campus in a safe way - e.g. "residency course requirement: at some point in the week, every week you must come into the university and sign the attendance log website from a device logged into the campus wifi" .