Isn't content persistence a relay issue rather than a protocol issue? Someone could run a relay that promises to preserve all your content. Doing so is a responsibility that not every relay wants to take, especially given that people are running relays for free.

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That's why you run your own relay. But clients are useless I they're not using outbox and your relay is not in someone else's list. They won't see your posts. The issue is not with relays as I would advocate to run your own. The issue is with clients not fetching other notes based on a users relay. Say If I write to my relay and you follow me but my relay is not in your list, if the client isn't using outbox, you won't see my posts.