Every site claiming to be a "verified" viewer is almost certainly a scam or a security threat. They typically follow a predictable pattern:
You can search for the user’s name in the Facebook search bar. While their profile may be private, photos they are tagged in by others may be set to "Public" or "Friends of Friends," making them visible to you. facebook profile private pictures unlocker viewer verified
The Myth of the "Verified" Facebook Private Picture Unlocker Every site claiming to be a "verified" viewer