When I worked in higher ed, I learned that professors retain a lot more ownership of their content than I expected. I don’t know if this is how it works everywhere, but I wouldn’t be surprised if that was the case here.
In basically all cases course material is developed by professors and TAs, though the current lecturer might have adapted from several years of previous work. Who owns the IP exactly is tricky (likely the university has at least an equal stake?), but I expect that if lectures are recorded, but not open-access then it's the lecturer's decision. It might be copyright issues, re-use of someone else's slides, not wanting to let students see past years' work, etc.
For example, I work at ETH and we have a large internal video archive of lectures (as do many universities pre- and post-covid), but some lecturers choose to post material on YouTube too. It's not a blanket yes/no policy at the institutional level, as far as I'm aware.
Another observation is, boredom (at least for me) is a necessary pre-requisite for thinking deeply about things. I've noticed this years ago when I was at Google. When a hard problem would arise (which was nearly every day), I'd go for a long walk outside, leaving my phone on my desk. By the end of the walk, I'd usually either have a solution, or a viable start of a solution. A lot of good work was done on those walks.
A few weeks ago, my power went out and my phone was nearly dead, so I let it sit for the time. In the time I had se thing id been working on "click" while just pacing around the apartment.
