are governments really accepting? thank you for answering
Sure you can. Check this
https://www.privateislandsonline.com/ But you have to satisfy few points:
1. you need to have enough bitcoins. Even the small island costs a fortune. And it's not guaranteed that you can build anything on it.
2. if you have enough bitcoins, you need to figure out what is the best way to convert them to eur/usd. It's not a problem to sell 1 btc but to sell 5000 is a different story. Plus you have to count on the fees and taxes you need to pay.
3. this i never really knew how it goes, but my guess is that with such amount of btc you would need some kind of proof where you got them.
4. There are costs of maintaining the island. Taxes and whatnot.
Greece is interesting since it's really nice country and with financial turmoil in the past few years there are a lot of islands on the market since they changed taxing policy and it's quite expensive to own one so many owners decided to sell.