Weakness in the linked devices security model. And so by extension, tools like "beeper"
If you don't link devices and check there are no linked devices your side of things is OK but you have no certainty in group chats or the other side one on one. So it's down to your own trust in the other party/parties.
If you don't link devices and check there are no linked devices your side of things is OK but you have no certainty in group chats or the other side one on one. So it's down to your own trust in the other party/parties.
"Two can keep a secret if one of them is dead"