WhenU

I just came across a forum thread at
xhttp://forum.abestweb.com/showthread.php?t=51743

Apparently, there is a list of 12,011 domains, which when entered into the browser (on computers which have the WhenU program installed), will open a WhenU Pop-up Advertisement. http://en.wikipedia.org/wiki/WhenU

Apparently, there are so many casino sites being targetted by WhenU. How can these lowlifes legally take advantage of whatever domains they choose to in such a way? They might not exactly be hijacking the domains, but what they’re doing is far from ethical.