By the Chinese government reading your imessage history from your iCloud backup, sorted on domestic servers. The keys are in China too. Same old vector.

I remember when Tim bragged that China had the ciphertext but didn’t have the keys. That changed.

It’s Looking like RCS was a Trojan to give China access to messages on the wire too.

That being said: Stronger, and additive key exchange methods should be encouraged. PQ3 is a good idea. Apple adopting this will push others to go with PQ key exchange methods. Todays adversary has clear text access to most targets anyway. Tomorrows will have to break the keys.