no private property means that the means of productions are of everyone, meaning that everyone shall OWN the means with which he produces stuff... simple as that ...

other thing is personal belongings, as a private key, a house, a whatever.

In a communists system people do enjoy the product of their work by having private belongings.

Private property means that the means of productions shall be owned by those who use it to produce.

For instance it means that if you are a developer you should have a computer. You should not exchange your labour or effort to own the stuff you produce with.

I can agree with the idea that Capitalism in it's pure form is not what we have today. But I don't understand how someone who is on a decentralized platform, trying to build a community, wants to promote an individualistic vision of society. Shouldn't we be meant to care about each other?

That's community, it is not capital.

And if nostr is about capital, about having more capital, becoming more rich, well I think I will have to for it and make a communist one