This is interesting and looking for the truth of this .... there may be positive things but it looks fantastic and unreal ... no one chooses to be stateless ...
Citizenship isn't a magical thing. It is just an organization that you pay for membership and it provides the service of advocacy on your behalf. There are many individuals out there who have more power to advocate on their own behalf than many countries could bring to bear on their behalf for them. For example: being bill gates and therefor being a citizen of bill-gates-astan is a more valuable self advocacy than having the advocacy of Afghanistan behind him (Afghanistan has the worlds least valuable passport). So I think it probably wouldn't be so bad if you had significant means. You would probably be better off being stateless and rich than Afghani.
The big problem for bill gates though is that he doesn't have time to handle the diplomatic relations necessary inorder to insure that no one declares war on his yacht. He could probably pay a hand full of diplomats to jettison around the world and advocate for him and hire a head of security to install guns on his yacht to repel any groups too small to be influenced by his diplomats (think pirates). He probably could do it but what a mess. Its just better to outsource this sort of thing. And almost all of us do and the ones who dont, its like you said, its not by choice. So just get a citizenship right? Countries provide advocacy services at scale and so are able to bring quality up and price down and tie it all up in a neat little package that save busy people valuable time. Maybe but there are some serious drawbacks to the prevailing model.
When you "contract" with a nation the contract is one way. You provide a guarantee that you will hold up your half and grant the nation the authority to imprison you or worse if you fail to uphold your duties. But what about their end? Not only is the contract ridiculously onerous on you but all you get in return are vague promises. We want the advocacy of course but that contract has a lot of baggage! When you contract with them you become a citizen and they are a sovereign. You are in effect ceding your sovereignty to them.
Is it possible to get the advocacy we seek provided cheaply and effectively at scale without agreeing to onerous terms and while having some accountability on the other end of the contract? I think an insurance policy provides the perfect model for this. The sort of organization that would be best in the position to offer a service like this would be a large multi national insurance conglomerate.
This would be a lifestyle only available to the rich at first but as with all other new technologies the price is highest for the trailblazers but comes down and becomes more and more affordable with time. Perhaps it could reach the lower upper class then the upper middle class some day. Probably the poor would always be required to cede some of their sovereignty inorder to be able to afford effective advocacy. Ceding some of your sovereignty is in effect one form of payment and for people who lack other means of payment this is perhaps the one they will always be forced to fall back on. But one of the big takeaways here should be the idea that people of significant means should be able to afford effective advocacy without needing to stoop to bartering their sovereignty. Its just crazy to think that a billionaire should have to give up anything more than some of his money in order to be able to afford this. But that is the prevailing world order. We need only one very rich person to push that first domino for us.
Maybe ill work on improving this and turn it into a proper essay and try to get someone with real means to read it. Either way its good enough for now. Tired of writing for the moment.