While it is true that Hive's stake is not distributed evenly, that plays no part on whether or not it would classify as socialist or not. Hive's system is malleable and agreed upon by its users, and if necessary, can change in the future to adapt to society's own changes. Witnesses are elected and witnesses control the rules.
Hive's very existence stems from a defiance of power, people didn't want their network essentially controlled by a single person.