It's not quite that simple. For example FaceTime claims to exchange session keys peer-to-peer without revealing them to Apple. It's no big deal to do technicall

It's not quite that simple. For example FaceTime claims to exchange session keys peer-to-peer without revealing them to Apple. It's no big deal to do technically. Of course Google/Apple still would have the power to backdoor the clients, as long as they can issue app updates. But it seems that US wiretap orders can't force them to go that far.