Even if you use an AI to filter spam, the central authorities will still delete events. There is no nostr without relays. They are central authorities between you and your friends. They have all the power to shape your reality in anyway they want. Personalized to you.

If you are not careful of which relay you choose, even today, you don't see a lot of criticism to certain projects, for instance. That's why your relay choice matters. Because they can censor you regardless of what the client does.