Great to have you here Dave, I enjoy your videos.
There were several people with scalable solutions. None of them really took off. My Viva Vivas design is focused on being able to invest in a small unit that can then be attached to others and grow organically costing under $20k per unit.
I believe much of the talk of scaling to a viable seastead that could survive in 50 foot waves in the 200nm from shore in international waters was replaced by the 3 phase approach of starting first phase in a nation’s protected waters, work on the engineering from there and move to the 12nm zone with slightly more waves but with more autonomy until finally reaching phase 3 of being 200nm from any nation being able to withstand huge waves.
The Seasteading Institute has been working with French Polynesia to get a Special Economic Zone created in one of their lagoons to test out a Phase 1 seastead. They hope to have the legislation passed by the end of the year.
Blockchain technology will certainly be playing a role.
A few other approaches have been in the works as well by folks on this forum such as Marinea which plans on a Phase 1 approach of buying a hotel barge/filling station that can be retrofitted and located in the Cay Sal Bank of the Bahamas within a protected waterway to begin growing from there.