You don't have to pay to participate? So what? Casinos have free versions too you know. Or are they insinuating that you can win $s without investing any B$s?

As a sidenote, claiming that there is no wagering, is also false. Chosing and supporting a team does involve wagering, only the wager is static and proportionate to the participants. Then there is a formula that adds up and/or devides wagers to the participants.