The Cypriot wealth seizure (attempting to cut a budget deficit in recession with a very destructive tax because they'd already ceded control over monetary expansion to an entity that isn't interested in doing it) is just about the polar opposite of Keynesianism ...

As for seasteading, there have been plenty of experiments testing the theory that a tiny nation can become very rich from being a laxly-regulated, tax-free place for rich foreigners to park money. It works very well until you try to generalise the results to larger economies and end up like a certain Mediterranean tax haven with a non-state currency...

The trouble with dismissing the knowledge accumulated by those whose experiments failed is the risk of being condemned to repeat them...