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.
I am fairly sure much of their accessibility work was instantiated by these lawsuits and settlements.
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.
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...
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.