On a related note, I was recently disgusted by Bunk1 [0], a SaaS for summer camps that allows parents to stay connected with their children, as it highlights "Facial Recognition" as one of its features on its homepage.
A friend's child is in a camp that unfortunately uses them, and "invited me" so that I could send a letter to the child (which is a useful feature). The URL of the child's photo is:
https://.../trained_face/image/...jpg
---
"Facial Recognition
When parents upload a photo of their camper, our facial recognition software scans each photo posted by camp and notifies parents when photos of their camper are available. Family members can easily see their camper in action without hunting through the camp’s entire gallery."