They don't need to move there to spread risk, just move through, and as such tourism is one factor.

Early in the pandemic, I had an assignment to photograph in a particular area that was actively dissuading visitors, had signage up as such, etc. I had to stop to refuel the car, but that was the extent of my contact with people and interiors otherwise.

I live in a state that had closed borders for most of the pandemic until recently (when our adult vax rate hit 80%). They're now open and cases are predictably rising. Opening the borders seems to have had a political backlash because while families can move in/out of the state, the rising cases has brought about business lockdowns but without the support/stimulus from last year.

Because their family is there, or because there's better work there, or they like the weather better or any number of reasons.