It's a different protocol. The point is that admins​ can't ban you from the entire network.
Discussion
nostr:npub108pv4cg5ag52nq082kd5leu9ffrn2gdg6g4xdwatn73y36uzplmq9uyev6 Thanks
You are basically having an private key that were used to sign an notes and then spread that signed notes across nostr relays.
Long story short, You are spreading your stamped post to numbers of servers called relay.