You're assuming that satellites are exterritorial. They aren't, they're ab initio the launching state's property and responsibility, barring other agreements to transfer them - and getting one out into a "legal void" isn't going to be trivial.

A ship in international waters with satellite internet connection would be much cheaper, except it runs into the same problems as described by the sibling comment: https://news.ycombinator.com/item?id=48469397

New startup idea: Starlink for TLS.