I recall LINE having indicators similar to WhatsApp for conversations stating that they were end-to-end encrypted - was that all a complete lie? Or are there si

I recall LINE having indicators similar to WhatsApp for conversations stating that they were end-to-end encrypted - was that all a complete lie? Or are there side-channels enough that it's technically true but practically meaningless? The metadata - who talks to who and when - in many cases is more valuable to an adversary than the actual content of the messages. All the crypto in the world doesn't help once the identity of one person you associate with becomes "of interest" you are of interest too and old-fashioned methods can be used.