There would be an industry overnight that would pop up to help people migrate where cost of living is affordable on a UBI because that is an insane amount of dependable profit to be made. It would be as simple as "your first month pays the move, and every month after that is last months rent payment".

There already exist communities and retirement homes whose entire agreement with its residents is "give us your social security checks, we give you food shelter etc". If you know constant money is coming in, arranging your business around being super easy to use for that money is a very lucrative opportunity.