There is actual census & taxpayer data. It isn't pretty for some Blue states.
Illinois - Lost $10.9B in AGI in 2021. Up from a loss of $8B and $6B in 2020 & 2019. Total AGI lost - $24.9B
New York - Lost $24.5B in AGI in 2021, up from $19.5B and $9B in '20 & '19. Total AGI lost - $53B
California - Lost $29.1B in AGI in 2021, triple the loss from 2019.
That is a lot of AGI going to:
Florida: $39.5B, $23.7B, & $17.7B for a total gain of $80.9B in AGI since 2019.
Texas: $21.2B gain since 2019.
There are more details in the article about how much FL gained from NY & IL & CA.
Here is the WSJ link:
https://www.wsj.com/articles/illinois-j-b-pritzker-taxes-states-irs-ec3da356
I am torn on whether or not this is a good thing. On one hand, high tax states are going to have a reckoning if this trend keeps up. They are either going to have to cut services or raise taxes.
But if these people moving from NY to FL get there and then vote in the same people they were electing in their previous state, well you can imagine........