Think of it this way: a private Facebook profile is like a locked room. A "private profile viewer" would need to have the key to that room. But Facebook doesn't give out keys to anyone except the profile owner and their approved friends. The platform uses strict authentication and authorization protocols. Any request to view a private profile is either:
To complete the verification, you are forced to fill out surveys, download untrusted apps, or input personal information. The Hidden Dangers of Using These Tools
Most tools claiming to view private profiles fall into two categories, neither of which bypasses real-time privacy settings:
Private data is never loaded into the source code of a public browser page. You cannot find hidden photos by using "Inspect Element" or viewing the page source.