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They really bury the detail IMO after the banner claim front and centre on the website (I guess because it's hard/awkward to explain without it sounding just like a difference in nomenclature).
What makes it work afaict is the combination of:
- there are still queue (inbox) IDs
- key (and (just initial?) queue ID) exchange out of band
https://github.com/simplex-chat/simplexmq/blob/stable/protoc...
So messages are still delivered to an identifier, it's just that every user has tonnes of identifiers (per contact/group), there's no server tracking and handling their exchange, and possibly they rotate via encrypted messages once established anyway.
Exchanging out of band gets you the secrecy, and having one per-chat protects you from a contact turning out bad/leaking/compromised - it's fine that they have metadata about their own chat with you, because they have that & the plaintext anyway.