The "Facebook Private Profile Viewer by iStaunch" is a clickbait scam. It exploits the curiosity of users to generate revenue through fraudulent verification steps. There is no technical mechanism for a third-party website to bypass Facebook's privacy settings.

If you need to see a profile, there are safer, ethical ways to go about it:

no legitimate third-party tool can bypass Facebook's privacy security to view restricted content without permission.

He knew he shouldn't be here. Sarah had set her profile to private months ago after the breakup, and the "This Content Isn't Available" message had become a wall he couldn't climb. But the curiosity was a dull ache. He clicked.

The iStaunch tool specifically targets "Locked Profiles," a security feature Facebook introduced to prevent non-friends from zooming in or downloading profile pictures.