Apple essentially failed to patch a current plaintext backdoor to iMessage end to end encryption (due to the fact that device backups, on by default, containing complete plaintext message history are NOT end to end encrypted and are uploaded to Apple with Apple keys each night) because they didn’t want to cross the FBI.

https://www.reuters.com/article/us-apple-fbi-icloud-exclusiv...

https://sneak.berlin/20200604/if-zoom-is-wrong-so-is-apple/