Bir Tawil it's a landlocked territory between Sudan and Egypt, any country want this piece of land, so why we don't found a descentralized Autonomus territory there, this can be posible, everyone could join and add to this project, comment this post and hit me via message to join our telegram group.
Are you talking about hijacking a piece of land in the name of decentralization, and how is it possible for the decentralization we are even talking about to play out in this type of thing you are proposing. Before you can ever occupy a territory, it still goes through an international body, even as big s United states and some other countries are, there is no way they can just enlarge their territory without getting approval for it from the body that is in charge, not to talk of just occupying a territory without the approval of the necessary body in charge.
Except maybe I don’t really get the message you are trying to pass across here, but based on what it could interpret to me, I am not sure it is a proposal that will fly in the name of decentralization you speak of.