akuperma:
Secular colleges also have mixing of genders (an issue not only during online classes but perhaps for group projects and the like), the horrific modern culture which pervades them including some of the courses, which they might require, that are anti-Torah to the core, and more real problems.
The pritzus issue alone, even in a virtual classroom, is enough reason to avoid secular colleges.
That’s besides for “minor” issues, like classes or exams scheduled on Shabbos/Yom Tov, etc.