This industry sounds dirty by nature, you can't 'clean up' spammers or prostitution either. Just because a pimp won't sell his girl to just any old John, doesn't make the whole act any better. It's people in the middle trying to make money off of someone else's hard work.

It is really simple, just don't attempt to trick users into installing stuff they didn't want to download in the first place (anything outside the bundle they chose to download). Additional steps on install only take away from the user experience and taint the experience of the application you are wrapping.