quoting note1fyp…q0ghRunning a relay for an app that sends public notes (such as Damus) is much more challenging than for an app that sends private notes (such as Keychat).
When a Keychat message recipient receives a message, the relay can delete the encrypted message, or at most store it for one month, resulting in minimal storage pressure.
However, a public note is intended to be stored for a long time so that future readers can access and read it, which significantly increases the storage burden on the relay. note14dl…9ec0
keychat on Nostr: From the perspective of how long notes are stored on relays, it could be said that ...
From the perspective of how long notes are stored on relays, it could be said that Keychat primarily uses Nostr as a communication protocol, while Damus primarily uses Nostr as a storage protocol.