Seasteading is the inevitable endpoint of the evolutionary line for technologies and phenomena that are already around us.
• Floating Wharfs and port installations
• Island resort hotels
• Oceanic Aquaculture
• Oceanic Oil drilling and mining
• Floating Ship support and repair hubs
• Floating Home and housing developments
Integrating those "floating things" to a big oceanic cluster you get a floating city by default just like you get a land city by amassing homes and workplaces in one spot.
It is not that much about "politics" it is about "solving the technology bottleneck" to make floating cities feasible and practical.