It’s the fixed supply and true decentralization is what singles Bitcoin out. Not to mention it was the first working PoW network to eliminate need of trust and the second one is essentially not needed as long as first one is adopted and functional 

 …okay, but what does that have to do with Nostr? 

 Nostr is built by bitcoiners and Bitcoin payments are native to the protocol. People can Zap ⚡️ you once you set up a lightning wallet!
https://m.primal.net/Hsns.jpg