It isn't Sky, it is a make easy money scheme. All they are providing is a list of web streaming URLs and most of the transmissions are low resolution and pretty much unwatchable, certainly no Sky channels.
They rely on people thinking that it is only a small amount of money and so what if it doesn't work that well, but these chancers sell hundreds of these a month and are laughing all the way to the bank and probably the benefits office as well. ;)