You really don't need to, if clients implement the outbox model correctly, and unlike Bitcoin, where every node needs to keep a copy of every single transaction in order to maintain censorship resistance, consensus, and full auditability of the supply, that is not the case for Nostr. We ONLY have the censorship resistance piece to worry about, and not every relay can store every user's notes, so being selective about the relays you post to is both wise and courteous. One of the best things about Nostr is that you can personally host your own content privately, too. This way, even if all 5(or however many you use) of the relays you currently post to decided to ban you, you can simply change your public relays to somewhere else and rebroadcast your notes from your private relay. The reality is, even this is very unlikely to happen unless you really did something deserving of the ban such that all 5 relay operators banned you in quick succession.
"even this is very unlikely to happen unless..." nostr:nevent1qqsfe2uafrnpvk8kax8txylc54ees4z6cjecfucplhazf3pu7l7lwvgppemhxue69uhkummn9ekx7mp0qyghwumn8ghj7mn0wd68ytnhd9hx2tcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhscd5ls7
The president of the US was banned on at LEAST 5 differnt social media platforms. Thats the litmus test for censorship: Can Donald Trump post there.
Trump can setup his own relay. Then he can choose to not ban himself. He could probably easily afford a large network of relays worldwide. Unlike mastodump, his relay network can't be "cut off" because clients contact relays directly.
People need to know where to look, they also need to know he was censored by the relays in the first place. But he can't relay that message if hes censored. Will folk have to scour the internet to check every time he doesn't tweet for a few days, or can the outbox model solve this automatically?
NIP-65 says "Clients SHOULD spread an author's kind:10002 event to as many relays as viable" the idea being that there is no centralized index, but these events are small and one-per-person (replaceable) so they can go just about everywhere without much overhead. That way people can be found as they move around.