That's why the homeless go to San Francisco or Maine. Better services.
The states are like incubators for different policies. The rest of us watch, and see what does work, and what doesn't work. For all I know, there are residency requirements for services in some places.
One of the things the Constitution protects is freedom of movement.
If a state wanted to implement something like Medicare for All, I think they could just do that.
If you don't like the laws in your state - change them.
If you live in California and you don't like the law in Alabama, what business of yours is that?