Why UC Berkeley this time? I don't know, other than the complainants came to the DoJ about them, and not some other school.
The purpose of the letter is not to cost the University or to stop them making the materials available. The DoJ never suggests that, it's Berkeley that raised the idea on their own. The purpose is to explain how the University has been violating the law and what they can to correct it so ultimately what is offered can also be used by people with disabilities.
If you care, please read the 10-page letter. The statistics used were out of proportion backed by limited user stories, and why is UC Berkeley considering removing the content? Page 4-7 may have some clues. But I wouln't really know since I have no idea what I am talking about.
FYI, Harvard and MIT were received with the same letters few months ago. It was on the New York Times, but I could still be wrong since I have no idea what I'm talking about.
The carefully worded letter appears reasonable, except what purpose was conveyed other than forcing the universities to incur high litigation fees? Using ADA as a weapon to purge free sharing of collective intelligence is despicable. I understand universities have limited resources and priorities for their enrolled students, but they should retaliate out of principles.
The community can help with providing captions. Charing $1 fee. Routing the money to a charity. Anything is better than removing the content because that is the complaint's end goal.