You can’t agree digital scarcity into existence. You prove it. Ford and others tried in vain. That’s the discovery.
Discussion
Of course you can.
This note, signed by my private key is 100% digitally scarce. That doesn't give it value.
Or better yet, the very first note. It was digitally scarce. No value.
Now, perhaps you, me and others here agree that nostr is better than X because of this ability to have digitally scarce social media postings. It now has value.
It has value because we all agree it has value.
An influencer on X however may not agree that it is valuable to have such a thing.