Facial recognition is one of the worst surveillance methods as this US case demonstrates: https://www.vice.com/en/article/xgx5gd/man-wrongfully-arrested-by-facial-recognition-tells-congress-his-story

Here is our explanation on facial recognition: How it works and - most importantly - how to stop it: https://tutanota.com/blog/posts/face-recognition-how-stop-it/