I've come across those websites too and I was curious about them, so I did some research. From what I've found, most of these private Instagram viewer tools are scams. They often ask you to complete a survey or provide your Instagram login details, which is a big red flag. I haven't tried any of them personally, but I've read plenty of reviews and comments from people who have, and they all seem to be fake. Some of them might show you a few posts from a public profile, but that's just to make it seem like they're working. When it comes to actually viewing private profiles, they don't deliver. Instagram has strict privacy policies in place, and there's no way these tools can bypass them without getting caught. It's best to be cautious and avoid using these tools, as they can put your account at risk of being hacked or compromised.