> Apple claims iMessage is E2EE, do we have proof they aren't siphoning the messages from the client once it's been decrypted?
Actually it is documented by Apple themselves that they receive the encrypted messages and the key to decrypt them when iCloud backup is used (unless you and the person you are messaging have specifically enabled their "advanced data protection" feature). They have decrypted messages in response to law enforcement requests.
Actually it is documented by Apple themselves that they receive the encrypted messages and the key to decrypt them when iCloud backup is used (unless you and the person you are messaging have specifically enabled their "advanced data protection" feature). They have decrypted messages in response to law enforcement requests.