The motion detection is a seldom used feature in most Apps, I only know it is used to undo input like Message.
But it is misused very some "smart" designer/manager, for example, Weibo, a massive social network app. On its launching screen, if user shakes his device, most of time by accident, the app jump to another shopping app's goods page. This is annoying.
We know Apple values user privacy very much. So user's input, like camera and microphone require permission to use. Accelerometer is also an input, it should be protected too.
Thanks.
