How far away is this to the closest town? When you create a techno hub, people will need accommodation and access to Mall's and entertainment and shops etc.. 

There has been several attempts by people to create their own sovereign area within the borders of a specific country and even in international waters and these people failed. The last guy fled the country when they wanted to arrest him for creating his own sovereign floating house in the middle of the sea. 

https://www.businessinsider.com/bitcoin-trader-chad-elwartowski-thai-navy-destroys-floating-house-2019-4?IR=T