The killer feature is the method of authentication.
But to want it, you have to know a bit about public key cryptography. Not very much, nothing that can't be grasped by say a 12-year old. But it requires a bit of habituation and a change of mental focus for most people.
It's a bit like getting people to take up Pilates, or skateboarding, or vegetarianism, or even personal computing, in a world where these things haven't entered the mainstream.
There is no immediate market for it, but it's the sort of thing where a market could at any time emerge very rapidly.
What's the single most marketable feature of Nostr?
I mean the thing with the greatest potential to engage a person's attention and hold their interest, and something that is sufficiently distinctive as compared to other offerings to make them want to re-use Nostr rather than something else.
My answer: It's the practice of deliberately self-authenticating on the internet through public key cryptography on an everyday basis.
The idea of decentralization, relays, etc. are just consequences of that practice. What is basically empowering about Nostr is that it provides mechanisms for distributing content that has been deliberately authenticated by the user with a digital signature from a private key.
If that's right, then the tendency among developers to try to hide this authentication mechanism from users rather than highlight it is very unfortunate. It's hiding precisely the thing that makes Nostr interesting. It's not a good way to market something.
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