I'm not taking part in this contest as Palit wants (a part of) my personal destails for it. However known they may be, they are not getting my details to get me a marginal chance to win something.
It doesn't benefit us particularly. We sign up and get one try at it. However every time someone clicks your link it gives you an extra shot at winning something.
So if you really were doing it solely to be magnanimous to the userbase, then you'd not have included the referrer ID would you.