You're confusing incorporating with operating. Corporations are incorporated out of places like Bermuda, but they operate on the "mainlands" (US, Europe, Asia, India, etc.) Their physical presence in the country they incorporate in is usually limited to somewhere between a mailbox and a couple of hundred square feet of unoccupied office space. Their operating costs are the same as if they were incorporated in the country they actually operate in. The only thing they are avoiding is the taxes that would otherwise go to pay for the infrastructures they are operating on. The geography is of no concern to them and the risk of the large native citizen population doing anything to them is nearly indistinguishable from nil. The risk lies almost entirely in the political vicissitudes of the country they operate in that allows an essentially foreign company to operate within it's borders. A seastead does nothing to mitigate that risk. It just adds a whole bunch of extra operating costs to build and maintain a mailbox on the seastead.