[AnthonyMouse]

> What experiment is being performed in Liberland that cannot be done in other countries that already exist?

Existing countries are captured by various interest groups who use their control over the government to their benefit. In a democracy this is generally various industries or government factions that control a large voting bloc or resources politicians need like campaign contributions. In a non-democracy the existing rulers want to remain in power and continue to rule as they see fit.

If the experiment you want to run is a country with an extremely limited government, you would either need a stable country where that is already the case (not currently available), or a way to overcome the entrenched interests in some existing country (good luck), or you need a new country not already beleaguered by entrenched interests.