I’m curious as to your definition of decentralized here. It seems you’re using the term to mean “global commons”, when I generally would use the term to mean something more akin to “permissionless” or “exhibiting a resistance to control via a singular entity or small group of entities”. Urbit is certainly decentralized by either of the two latter definitions, though a particular Urbit server surely wouldn’t constitute a global commons, which seems closest to your definition.