Where do the existing "readily available, off-the-shelf encryption solutions" mentioned in the link fall in this dichotomy? Are they unbreakable because no netw

Where do the existing "readily available, off-the-shelf encryption solutions" mentioned in the link fall in this dichotomy? Are they unbreakable because no network administrator can read my WhatsApp messages? Or are they broken, because Apple can push out an OS update and steal messages without the user knowing?