#Nostr use: personal relay for recording output. The client records all the audio you speak around you, trancodes it to an encrypted DM.
The client can then stream back text or audio of last conversation, the last time you said 'phone charger', phone numbers spoken over the last month.
Most importantly, the client can play back the last four or five sentences spoken. I forget what I'm talking about so much, this would pay for itself as a mood regulator.