Comment by Telaneo

It wouldn't surprise me if most of it is still around. The amounts of data are probably fairly small, and thus unless intentionally deleted, it's probably still there (maybe unis in Europe are more likely to bother to click the relevant buttons as to comply with the GDPR?). I can't imagine storage becoming an issue unless you've got a huge uni or classes that deal with video (and even then, those probably end up on Youtube as private videos, or only as really small clips).