Nope. Nostr depend on dicatorship happen on those relays. Its just less censor than twitter.
Dictatorship? You're confusing it with Mastodon.
If all major relay choose to deny particular messages/notes or specific npub those wont be seen by many. So relay owwner have real control on who see particular messages. Dont this strike u that its always the same npub that are projected on every relay, every time. They have a reply for this "problem" ==> its a discovery problem XD So nostr depend a lot on those dicatator that are call relay owner.