Universities have thousands of students, many coming from different parts of the UK or from abroad. It's a higher risk than for schools.
How so? The ones that are here already will have been here since the start of this term. If they go home they probably won't be allowed back anytime soon.
DDs uni seems at the moment to be moving towards online teaching but keeping accommodation open for those who can't go home for whatever reason. Apart from the overseas students, quite a lot at this point don't want to return to parents who are in at-risk groups or who currently have symptoms.
This seems like an appropriate balance.