Great question
1. People will be steadily pushed away from legacy social media as restrictions on speech and reach increase and as ID verifications increase
2. People will use Nostr more and more "without knowing it" as more applications are developed on the Nostr protocol like Bitchat
3. Nostr allows users to monetize faster than any other platform
4. Nostr is up when other social media's servers are down
Lots of other reasons exist
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