Libertarianism doesn’t mean no laws/regulations, it means non-aggression. Libertarianism is compatible with private cities with borders, pro-worker ideas, anti-commie laws. The main thing is that the laws are voluntarily imposed. By joining the private city you sign a contract consenting to the laws.

The thing is there right about borders. No need for a wall IF: public education, public healthcare, and other government welfare programs don’t exist or illegals aren’t eligible. Regulations for businesses are terrible. They only hurt small businesses, used by big corps to limit competition. Immigration is fine if you have a healthy economy you want immigrants. Doesn’t mean import them from shithole countries. It means allow normal immigrants who want to work to make a better life foe themselves and family.