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.
quoting note14dl…9ec0If you can't read notes from gitlost_nbot (nprofile…l65g) that means Nostr has failed.