Ya'll are talking lawsuits and organizing protests, but the reality is probably just that no one (outside the Bluesky/HN bubble, which is tiny) cares. Very few probably care what their local government is babbling about today in general, and even fewer what platforms they're using.
And yet if someone did care, there's a decent chance if they asked the right person in the right way they'd be like "Oh, Mastodon? Okay, sounds neat, oh you know what it's just another checkbox in the software we use to cross-post everything! I'll just check the box!"
But nah, lets not do the easy thing, lets look up legal precedent and ponder the ADA.