If Nostr scales to millions of users, there will be a significant increase in the number of bots and scammers. Nostr users will likely want some way to filter that out of their feed without spending hours a day muting individual accounts.
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Also, in the future, the amount and diversity of new ideas will increase exponentially. By nature, human beings have different interests and new ideas are not expected to be interesting to everyone. Content curation will prove crucial to manage that aspect of society