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This is a common misconception that a proof of publication ledger means data that magically can't be forgotten... That only applies to Bitcoin, for very specific reason. The reality is; 1. A proof of publication is not about perpetual availability it is just about consensus on what is everyone is seeing in a given window of time. 2. Nostr doesn't do anything to stop perpetual archival beside just being not important to archive. If you really want you can force the archiving thing on Nostr without its consent by simply crawling the top most relays and timestamping that with OTS. But that wouldn't be a proof of publication, because it is not signed by the relays, so no evidence that the data existed on popular relays that people query. So now you have all the downsides of archiving (user signed events) but no proof of publication (proof that most people should have seen this in time). In fact for a proof of publication to scale it has to prune history or in other words it has to only prove publication temporarily not perpetually... But again, archiving is another layer that is equallu possible and simple with or without proof of publication.

You missed the point. The goal is not even deal with any of that stuff.