Why Are Follows Stored On Chain?

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Can someone tell me why it makes sense to have follows/unfollows stored on the blockchain? Why should that information be stored at the consensus level? That information can be useful but why should it be stored on chain? That information does not change very often and does not involve a lot of effort to process but I thought the idea was always have Hivemind store that type of information.

Why Are Follows Stored On Chain? | Ecency