The ones I have used do not accept photos, they require real-time video with the front-facing camera and they prompt you to move your head to face different directions on command. Not impossible to attack, I'm certain, but it's tougher than simply uploading a photo.
The ones I have used do not accept photos, they require real-time video with the front-facing camera and they prompt you to move your head to face different directions on command. Not impossible to attack, I'm certain, but it's tougher than simply uploading a photo.