You are describing the entire web, not Nostr alone. There is nothing in Nostr's design that makes it more resilient than the web, aside from using keys as identities. The rest is exactly the same. You put your data on web servers and hope other people can access and share it. Relays can censor you, DNS can censor you. Apps can censor you. So, yes, the web is fully open, and if you host everything yourself, you do have more control. But Nostr didnt provide that, DNS did. And if you need any other computer on the web to help you find or distribute data, you become censorable again.