When it installs, it pops up a dialog box saying "Agree to this EULA?" with the EULA a hyperlink to go to its EULA. (Which is something totally absurd that basically boils down to "we own your computer.") The dialog box only has an OK button, though you can, of course, click the close box. If you click the close box it makes a single change to the registry so it never tries to install again. If you click OK it starts spamming your grandmother with porn - but hey, you agreed to it!
I bet almost everyone would click OK.