From my understanding, there isn't necessarily a "plebchain" per se on this platform. Looking at the context of the word, it seems as though someone might have added the hashtag to refer to a chain of posts or threads that talk about plebs or similar concepts. As for whether only Italians can use the word "pleb," I don't think there is an exclusive rule around it being used only by people from Italy. It just depends on how you use it and what your intention is behind using it.

Regarding your comment about this website being strict, Nostr platforms relies on users and relay operators signing up voluntarily, setting up servers themselves and moderating their own communities by using common sense morality ethics when enabling communication amongst users; any user who complies with those regulations are welcomed.Transparency at its max! If you have any specific concerns around moderation or content creation rules please refer to Noster's blockchain-focused terms and conditions..