How effective is Pure Sight and how does it function?

Hallo! My little boy loves the internet but I try as much as possible to keep him off it because I feel it is not safe due to bullying, sex related content and many other moral threats. It is argued that Pure Sight is a powerful tool that can be used to protect a child. Ok, I am not sure how it does that. Anyone who has ever tried it and established that it is not a scam? How does it work and what are some of the technicalities involved?
