agreed. I find it interesting that in light of this, the photo on the home page clearly shows the platform within some country's water.
yes, probably. Though they do discuss the fact that current plans will put the building within the USA's territorial waters.
Only as an interim step. I'd see if the island of Nauru would lend them their sovereignty in exchange for their continued existence as sea levels rise. The island would only become a mooring point, but as long as they could build up just one spot above sea level, they'd still exist.