It's censorship-resistant and transparent, not private.
Like Bitcoin.
There's a gain in individual freedom when markets can't be easily subverted and manipulated, but that only works if everyone can easily see what is going on. Freedom is not free.
Freedom is much cheaper than slavery.
Also choosing nothing is much more expensive than making the wrong choice.
The censorship resistance Nostr provides is very different from that which Bitcoin provides.
There are some blockchain-based (not Bitcoin-based) social networking systems and they do provide a kind of censorship resistance similar to that of Bitcoin, but Nostr is fundamentally quite different.