If they do not allow you to turn it off, then it can be used for great evil. For example, forcing you to look at ads. Pop ups that you have to look at, that you can not turn off otherwise. In the terms of licensing, forcing you to buy another license of a video game if your friend/spouse/child uses your app too much.
Then we have tracking issues. Like if you wear makeup, glasses, hats. If you are a boy or a girl. Taking pictures of you when you are not fully dressed.
The tracking will have to be done with the front facing camera. That can cause, either by intent or misuse, abuse to the consumer.
No matter the level of refinement on it, what ever resolution that can track an human eye is good enough to be targeted of malware and misuse.
So, as long as Samsung allows the user to turn it off, then I am happy.