: Many of these sites are designed to harvest personal information. They often require users to enter their own Instagram credentials or complete "human verification" surveys, which can lead to identity theft or account hacking.

Detail the you might have encountered. Let me know which specific approach you are interested in.

Instagram runs on SSL/TLS encryption. When you view a private profile, the server verifies your credentials (your login token) against the account holder's privacy settings. If you are not approved, the server simply refuses to send the image data. There is no "glitch" or "exploit" in the live version of Instagram that allows a third-party viewer to intercept that data.

Many of these sites force you to download malicious software disguised as "viewer apps" that can infect your phone or computer.