Prerecorded lectures

Many universities have been forced to give their lectures online. Some students seem to prefer physical lectures, and some online lectures.

Overwhelmingly the biggest (potential) long-term advantage is that there now exist entire degrees' worth of prerecorded lectures, many times over. This has the possibility to give a meteoric rise to the scale of maths accessibility and outreach.

However, as far as I can tell most of these lectures are currently sitting behind university login pages, and I suspect that the main reason is basically institutional inertia/a prisoners' dilemma situation. If a few universities' lecture recordings were released, this would probably make others less reticent to release theirs, and cause a culture shift. Note that the same thing happened a while ago with lecture notes.

Needless to say if nothing happens and the recordings are just deleted in a couple of years, it will have been a collosal missed opportunity.