Are you following the discussion of relays getting too big and too costly and thus shutting down?

It seems inevitable to me that relays will eventually only keep 30 days of events per user (even that would be 12TB per day if Nostr had Twitter scale, so even that is not feasible for anyone but industrial relay operators).

So it would seem that Nostr is not suitable for apps where events should be stored reliably for a long time.