I don't know why you would want this, but wss://personal.relays.land/ is a relay that only you can write to and read or delete from.
Discussion
Saving drafts, if not running a relay on the phone.
This would be a great relay for personal usage of NostrCal if they also accepted gift wraps with the p tag too.
You can probably just use wss://inbox.nostr.wine/ for that.
two people that share one nsec could message each other privately , no?
Private copy-paste between devices
Notion/Evernote on Nostr with multi-device sync
Journalling
Profit
what the heck
It's like a backup that you do not own and can rug you at any time. Some uses cases do exist. Such as: you could use it for drafts if they accept them.
Seems like a nostr version of supabase
Maybe it could be used as a personal diary.
Backups. Same idea as haven, no? https://github.com/bitvora/haven