I don't care much about the shape of the earth, I used "global" as something that affects entire world. The point is that there is a scenario in which any cryptocurrency might seize to exist. For example imagine that the operational costs for running a Hive node exceed the potential profit and witnesses decide to shut down. Then Hive and all hive-engine tokens will disappear into thin air where they came from. Something that is not possible for "hard money" as gold