Sealand isn't a great example considering nobody recognizes it as a country. Tuvalu might get away with it since they would've been a "real" country in the past.
Similarly, I wonder what would happen if Tuvalu decided its laws should not recognise copyright as a concept any more. The government could run an official "legal" file-sharing site and other countries would have to decide whether to prevent their own citizens from accessing it. I imagine these other countries would lose a lot of sympathy for the people of Tuvalu if such a site were created, though.