Because any decent implementation doesn't trust client cookies. Typically the server signs them so the only messing that can be done on the client side is to delete/not send them.
Randomly exchanging cookies with other users (assuming they are even structured that way) is a considerably larger coding challenge than just examining cookies and giving an arbitrary score.
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That it will drown the readers of those cookies, the advertisers, into a sea of fake data, forever fauling up their ability to know who is who.
Yes, but why require users to play a game for that, why not skip that part and just mess with the cookies?
Because any decent implementation doesn't trust client cookies. Typically the server signs them so the only messing that can be done on the client side is to delete/not send them.
Still doesn't explain why you need a game. You add your cookies to a pool which randomly exchanges them between users. No game needed.
You don't "need" a game. The point of the game is fun while screwing with people trying to profile you, but poisoning their data instead.
There is a precedent with barcode games of collecting things http://en.wikipedia.org/wiki/List_of_barcode_games
Randomly exchanging cookies with other users (assuming they are even structured that way) is a considerably larger coding challenge than just examining cookies and giving an arbitrary score.
I dunno, I haven't made this up, I just have a wild imagination...
Besides, I play the hosts game with advertisers.