Hmmm
Turnbull's speech singled out Whatsapp, Telegram and Signal, asking why they should “be able to establish end-to-end encryption in such a way that nobody, not the owners and not the courts, has the ability to find out what is being communicated”?
Well, maybe because that's the f'ing point of it. If I want you to know what's in my communications, I will copy you in, mate. Until that time, it's not yours or anyone else's business.