I'm eternally disappointed that none of these libertarian projects even manage to survive long enough to hit the "oops we just reinvented government and taxes" stage.
It's the same energy of a kid running away from home to the tree house in the yard. All they want is to have all the benefits of society (imagine if they were barred from reentering their home country or traveling anywhere else because Pirate-Monaco-Dubai-island(tm) doesn't have real passports) and not be held responsible for their destructive behavior and impulses.
The reason Pirate-Monaco-Dubai-Island isn't productive is because all of the productive land is being squatted by rent-seekers. There is some history that indicates that anarchistic sort of socities can be productive, for example kowloon walled city.
The most extreme form of libertarianism, minarchism, still proposes the existence of a government