Are there lecture recordings?
The hairiest issue here is when there's student participation. But you don't need each quarter to be online, just once every time there are significant course changes. The quarter that will be uploaded could be announced as such and students could consent to being recorded. But this isn't a big deal, MIT has a lot of open courseware with students being recorded. It'd be easy to survey and compare student experiences with/without recordings. But the benefit for the public could be enormous! Think about the public good of every publicly funded university's courseware being accessible online for free.
And even if some public universities are self-sustaining now, that doesn't lessen the fact that public money was the major cause that started that flywheel.
And regardless of funding, UW, like all public universities, has an explicit directive to operate for the "benefit of present and future citizens of the State of Washington"[2][3].
As for course lecture quality, if it's worthwhile to the students, it can be worthwhile for the public.
[0] https://www.washington.edu/opb/uw-data/fast-facts/ [1] https://educationdata.org/how-do-people-pay-for-college [2] https://www.washington.edu/regents/ [3] https://apps.leg.wa.gov/RCW/default.aspx?cite=28B.20.130
For anyone else interested in Alg geo, Ravi Vakhil’s videos are very good and accessible.
However, Blinn writes that some of this material was presented in more detail in some of his "Jim Blinn's corner" articles.