There are too many scams on the internet now. Such software help to block some porn websites or any other unwanted ones. It can also block some sites from launching games, videos or files without informing you. With these software you are totally in charge of everything.
Well, it really depends on where you are going to use it. I use internet restriction for my both children.. in such a way I can control that they will do hometask but not just sitting in their social networks..
Very often employers use such software to check if their workers do their job properly.
In any case they are important. If you want you are welcome to write me and I will recommend you the best software.