I wonder if there has always been a backdoor. Suspect it was added after WhatsApp was acquired by Facebook. (At the request of [I]you know who[/I].)
But you have to take your hat off to Facebook, these days they’re really challenging Google’s pre-eminence when it comes to evil.
If only Apple were a bit more open. Then we could fully enjoy a thrilling three-way fight for the [I]Voldermort Memorial Prize[/I].