for example if the scammer has access to a list of emails that are interested in gambling they can send half of that list a result of a match and they send the other half the opposite result, they do this for several games, at the end there is a small subset of people that have received all the winners and that is when they ask you money as the recipient of that email believes the scammer is for real when he is in fact only playing a numbers game.
Yeah possible, but what about the bookies who has fixed a match and know the result of an upcoming match when he got access to such a list of gambler's email/mobile number? Definitely they will try to maximize the odds by spreading opposite result to group people who are tend to bet with.
Honestly I have received such email and PM from newbies of this forum itself. There are hundreds of such scammy telegram groups are available. They may not give all tips for making you lose. They may give tips which may get you at least 50% chances to win and another 50% of betting will boost their profits by enabling you to bet opposite to their match fixing.