I don't know, but my guess is the people that moved didn't like the policies of the state they left
take the bay area salary, work remote in texas/arizona/nevada because its cheaper and rationalize it by saying its the politics thats making me move.
i've had this conversation 5 times this week with friends and colleagues, and none of them have actually spent more than a week in texas/arizona/nevada.
anyone that wants to live in one of those states, try it for a couple months if you can before taking the dive.