I typed a post and MN ate it 😒 I FUCKING HATE IT WHEN THAT HAPPENS. Anyway.
I think there are good reasons for lectures to be recorded by the institution, though not necessarily made available to all students. I left there (as a student) in 2020, and had permission throughout to audio-record lectures for my own use, as a disability accommodation. The University's disability service was great at getting helpful disability accommodations written up for you, but in practice…
Even with a DSA-supplied directional microphone, the sound quality of a recording taken from the student's location is inadequate. You mostly hear ambient lecture theatre noises — typing, coughing, shuffling, sniffing, benches creaking, doors banging, birdsong, and so on — with a faint suggestion that somewhere in the next county, a medievalist or a biochemist may be trying to be heard.
Theoretically I was also supposed to be able to request slides in advance so I could sync them in lecture capture software with my audio recording, as the lectures frequently would have made little sense without the slides. The one time I asked (nicely!) for slides (before discovering any recordings I made were crap, even if I somehow managed to get to lectures ahead of everyone else to ensure a seat at the front and for setup time, and avoid typing or sitting next to someone typing), I got a discouraging response, and given my recordings were pretty useless anyway, I didn't ask again.
There's no point to a disability accommodation that the student can't actually use (and that wasn't the only example of supposed accommodations that in practice either didn't work or were refused, but that's beside the point). If they offer that accommodation to certain disabled students then they must believe it's a necessary accommodation in order to provide a level playing field. If it is necessary, then the accommodation needs to be actually usable, and not require the disabled student to jump through unnecessary, difficult hoops. If a necessary, usable, and non-disadvantaging solution can reasonably be provided, then it should be.
Rather than making every student with this accommodation have to try and work out the principles of audio engineering, learn to advocate for themselves with authority figures who are reluctant to follow the accommodations, and teleport across sites to get to lecture theatres before anyone else, Cambridge could definitely afford to make proper lecture recordings, including slides and audio, available specifically to disabled students who have this accommodation. You could digitally watermark the files to discourage sharing, if you wanted, which is more than you could do with any recording the student makes, and/or require students to confirm that they understand they don't have the right to share the lecture. Lecturers' rights and interests need to be protected, but I think most disabled students needing to access recordings of lectures would understand why restrictions would be required, and wouldn't abuse the accommodation.
The outcome of this provision would be the same as the purported desired outcome of the accommodations I was granted — audio recordings, with accompanying slides, of their lectures, for disabled students who would benefit from this. The fact that they don't want to provide University recordings for disabled students suggests to me that, perhaps, one reason they were okay with disabled students having this recording accommodation was that, in practice, we all realised it was pointless even trying, so the lectures didn't end up actually being recorded at all.