These are usually anti-spyware or security software applications that use various forms of deception and/or unethical means or show a history of negligent false positives to goad the end user to make a purchase.
In some cases these applications maybe downloaded with some form of unwanted software at which point the rogue application is offered to the customer as a way to remove the unwanted software.
This rogue anti-spyware application is often distributed by means of misleading sponsored links. In order to install this application the user must agree to install "A Better Internet" adware also.
From the EULA,
Spy-Shield is integrated with a third-party ad-serving client which displays relevant, non-intrusive advertisements to the user. These advertisements ensure that we are able to keep providing users with the best free anti-spyware protection available. You acknowledge that you are aware of the placement of these advertisements within Spy-Shield and agree to their display.