Very old idea. People wanted to host trading floors on rigs or tankers in international waters in the 90s so they could avoid tax and regulation. Not sure if anybody actually did it. Possibly due to latency? Or regulation?
Nobody cares about oil rigs and you camping there except the owner.
But if you announce that you are going to do it to circumvent regulation or taxation you need to have a nation state ready to defend you (at least with words). That will cost you and makes the exercise pointless (you can simply setup shop on your protectors sovereign land).