https://www.ada.gov/resources/web-guidance/
There are a lot of opportunistic/good hearted compassionate lawyers making a good business of shaking down smaller website operators for ADA compliance.
https://www.natlawreview.com/article/california-court-appeal...
Kind of a shame, because it was my first thought too--losing the accessibility team and then removing all the accessible clients definitely won't make Musk many friends among disability advocates.
I am fairly sure much of their accessibility work was instantiated by these lawsuits and settlements.
Social media? Not to my knowledge.
But not having a website that's usable by the blind cost Target $6 million: https://www.cnet.com/tech/services-and-software/target-settl...
There are very few large entities that have not been impacted by ADA lawsuits at this point -- even ones that had accessibility as a core value before the lawsuits.