Even in FL, anecdotally I know many people who moved there from CA or CO or NY not because they disliked the place they came from, but because they were forced

Even in FL, anecdotally I know many people who moved there from CA or CO or NY not because they disliked the place they came from, but because they were forced out by influxes of _other_ people who made more money, drove cost of living up, etc. The sentiment is basically "Florida isn't as nice, but its cheap, so we make do because we have to." The brain drain from much of the rest of the country into a few small metro areas is forcing lots of middle-income people from those areas to migrate to cheaper places, and this would seemingly skew the numbers when you're looking at overall population migration.