Shared nostr private key sending DMs to self is one goofy way of group chatting. Backward compatibility (works on most clients), plausible deniability, can post anonymously, scales to infinite number of users. Just need to coordinate creating a new group each time members change or want to rotate the key.
I haven't done groups yet, but we can do it like signal: Group members send their group-specific Nostr public key & symmetric decryption key to all other users in the group. Rotate key now and then, at least when users leave the group.
Also for multi-device use we can do like Signal: have multiple double ratchet sessions with your own devices and devices of others, send to all of them. https://signal.org/docs/specifications/sesame/
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