Free is the keyword. In this age of technology and free information available, noone wants to pay for anything. Even for things they would have paid in real life. Somewhat it's fair. Those free services allow you to get a teaser on what the premium service look like without really giving personnal informations away !
Webcam comes second. That's a relly nice piece of technology. Transmitting both ways informations (video and sound) for possible very long distance. And you can get one for your home, so you don't need to tell anybody what you're using it for !. Depending on your internet connection speed the quality will vary greatly.
Chat is the last of the three. Ah communication ! People can see video, sound, and even type ! Sometimes, smileys, because they're so widely used express a feeling better than a sound or a face. Even for shy people who can't really express themselves verbally they can still express themselves pretty accurately with their keyboard.
In brief, Free Webcam Chat is a wonderful combination of way of communicating at a price you can't beat. Now you will probably want to try their premium service to get some extra features