The point is that they didn’t move to NYC because they love NYC as a place. They moved there because a Bangladeshi network can help you get a job at Dunkin Donuts and sign up for various social services. Once they had their legs under them they left the city.
I did just this, left San Francisco for Nashville. Anecdotally I’ve been seeing a huge uptick in California plates here in Nashville. Great, I did the same thing, welcome, but now don’t ruin it.