Would it be possible create a constellation of satellites hosting webservers with some sort of wireless connection to the rest of the Internet, assembled and launched in international waters, so that you could host anything and be immune to any law enforcement entity (short of military action against the satellites)?
yes. but it would be very expensive.
i seem to recall, in fact, that there has recently been an in-orbit commsat offered for sale.
but they're delicate. and lasers are powerful, these days.
it would be much cheaper of course to buy a slice of a satellite - that comes up for sale quite often. but centralized, government control...
all in all, p2p is better - or the darknet.