Because its an absolute nightmare for newcomers.
It's not an issue of the blockchain being a difficult concept.
It's that none of the tribes really explain what they are and appear like totally different platforms. Plus a lot of very basic features like adding profile and cover photos simply don't work.
If you were to strip away anything to do with the Hive engine, and have the network just being posting and comments, account creation is still that difficult you'd struggle to get people to stay.
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