So, using a free web app with ads and a paid option (think flickr) is ok, using a free mobile app with ads is ok, but when it's a desktop app it's no longer ok?
This is not about doing shaddy techniques / crapware / spyware. This is not about changing user settings, installing toolbar, sniffing on user's activity, etc... It is just about displaying relevant text link ads inside a program you enjoy using.