A lot of military infrastructure is becoming electronic in nature. If we wait a few years and then fill up seasteads with computer security experts and hackers, well, that’ll be an army all on it’s own. Remember the little country of Estonia and how Russia recently defeated it in a recent internet war, devastating Estonia’s infrastructure? Have internet, will travel.
Seasteads, like many small independent communities, could easily fund themselves by serving as independent Internet Servers and engaging in ebusiness, then using the revenue to buy more satellite bandwidth, computers, and Seastead property… ad infinitum.