I am confident some of the stock advisor websites are doing the same thing. Just sending out random advice and collecting subscriptions from the winners.
Conversely, if you know Santa's Little Helper is going to win the 6th race and told everyone, that would drive DOWN the odds and your potential payout. You'd have to have insider knowledge, then fabricate and disseminate a lie so that the actual winner gets bid down to 99:1 least-favourite before the race.
So the incentive model is different. In a way, in the stock market, being seen as a psychic genius can be a self-fulfilling prophecy. $FOOBAR doubled in price because people chased your prediction, not due to fundamentals.