It is local on your phone, unless you expose it via Tor. Use as a backup (it can restore follows), and storage for drafts. If exposed as a Tor service it can be used for DM and outbox model. 

 nostr:nevent1qqsxchyvxmd8fcseamlvyjt2cstfmpc2l34amkc74de9krfrhqljgzcppemhxue69uhkummn9ekx7mp0qgsda2memtapc2lykjnd8t9px4ake2stw39lg6k49xj6u3jz3pteu6qrqsqqqqqp58c9e6 

 Thanks, I'll look into it.