I think you're right that if you start openly doing illegal things like offering "data havens" your movement has a time limit. And in this case, the couple made

I think you're right that if you start openly doing illegal things like offering "data havens" your movement has a time limit. And in this case, the couple made a mistake of building in an area where a country could still theoretically claim sovereignty. But, if you're far enough out and not actively doing anything illegal (gambling is probably ok!) like allowing hosting illegal content or trafficking drugs, I really don't think anybody would care. I do think seasteading is a bit larpish but I think it's something you could do legitimately as long as you understand your boundaries. Like, if you set up some kind of fishing/aquaculture/gambling operation in the mid-Atlantic, I don't think anybody would stop you