

this doesn’t kill the fediverse. mississippi can’t do shit to you if you aren’t in mississippi unless the state you’re in agrees to cooperate with them. and that’s only after they subpoena your hosting provider, which might not even cooperate with them at all if they are outside US jurisdiction. and if you go through cloudflare? that’s another subpeona from a corporation that doesn’t like revealing information about their users and has gone to federal court on many occasions to fight both state and federal governments.
any state that doesn’t have one of these laws on the books is unlikely to decide to extradite you for something that isn’t illegal where you live, especially since it’s not a criminal charge.
the “bigger-boys”, as you put it, are currently fighting it together on appeal in a lawsuit. once the appeal is finished, it will probably head to the supreme court, where Kavanaugh has said it will likely be found unconstitutional.