I hope they will share so we will know if it's really possible. I mean, as the saying goes, casinos always win because they have the advantage, so how come people are making a living in sports betting?
I think you are misunderstanding something here -- "casinos always win because they have the advantage" is when it has to do with games like Dice, Blackjack, Keno, Crash etc ,and other in-house games, this believe is not actually valid with sports betting, sports betting is a worldwide game where result is visible to everybody, there are no ways for casinos to cheat gamblers here except the casino are managed by scammers.
In games like Dice and the like, the gambler is solely dependent on luck win, and whether this gambler gets lucky depends on the casino's algorithm or game provider, but in sports betting, the gambler is not on dependent on luck, but he or she is also have a knowledge advantage, this means that if the gambler is really knowledgeable about the game and the players and can all the time, correctly predict which team would win, it is very possible for such a gambler to make a living off betting.