I was going to say that the way to avoid this eventuality is to insist that any competing system have the same granularity of permissions and compartmentalizati

I was going to say that the way to avoid this eventuality is to insist that any competing system have the same granularity of permissions and compartmentalization that it presumably will on iOS - but then I realized that, naturally, the very same applications that stand to use this technology in the creepiest ways will also add user-facing features to encourage the granting of these permissions. So Facebook will add its own spin on animoji, requiring full face-tracking permissions - and then begin quietly mapping emotional response to every timeline entry.