It's a convenient narrative. Here's another one: Senior administrator at the university doesn't like the project. It costs money to provide as it is, and money is always tight at a public university. They should be more focused on income generating patents (which, BTW, UC Berkeley is/was good at). And now they want us to spend even more money? Let's kill the project.
I spent a long time at universities, and I also worked for 1.5 years in the university's disability division, so I somewhat know the needs of the disabled. Part of that division's role was "policing" professors' course pages (albeit only when a student complained), so I'm familiar with the territory. Our position was clear: It's the law.
I also know how university administrator's think - they rarely like initiatives meant for the public good for free.
Finally: How much money did they make suing UC Berkeley? Did anyone (other than the lawyers) make money out of it? Why are people so certain this was a money grabbing lawsuit?
The difference is that they won't win in court. There's no law requiring you to make your open source work accessible - unless that open source work was part of a project for which you got federal grants.
Sorry, but it's clear that many commenters to this thread no almost nothing about what happened, and are merely engaging in outrage mania.
In the real world, though, when people ask for grant money, they justify how the money will be used. If you didn't put a line item for accessibility, and didn't budget for it, it's on you.
There are even more mercenary groups, whose business model is basically extorting organizations for donations, threatening with expensive lawsuits and bad publicity.
It seems pretty likely to me that NAD's lawsuits are more about this, and less about actually caring about deaf access. There are a lot of them, and they seem to go for big pockets. Probably the efforts Berkeley went to to offer accessibility would have been deemed good enough to not sue over (for now) if they had donated.
It doesn't mean the causes such orgs ostensibly fight for aren't good. It's just that when enforcement is by lawsuit, it's inevitably selective enforcement, and that just creates a huge business opportunity for unscrupulous lawyers (which there is no shortage of).