I definitely have never given any one any sports game code to play, let alone losing while the person I shared the game code with wins, but I sure have been somewhere where I witnessed this same scenario happen before my very eyes, and if I still remember well, I've shared the story a couple of times on this forum.
I scenario played out between me and a casino worker recently, I was discussing with him about sport bet and how risky it is to win them, and only then he opened up to me that he works at ground casinos, the only physical casino house known to us in this part of the world, and he said that in the coming champions league and premier league, he will be givinge some games code, that their are sure predictions.
The question that I asked him and he was unable to answer is that, are those that predict the game going to decide the winner, just like your in house games at the casino, uptil now he was not able to answer, only then I told him that there is not sure game any where, so I don't share my betting codes neither do I accept code to bet on from others.
The only difference with this from mine is that, this one deals with sports betting, while that which I've seen happen was based on lotto, often called "baba ijebu" here in Nigeria, a forecaster gave his friend some set of numbers to play, while the forcaster himself played an entirely different set of numbers himself.
At the end of the day, out of the five set of numbers the forcaster gave his friend, 3 numbers came out(played), while all the numbers the forcaster played himself, non came out(played).
The show was a shameful one to behold actually, the forcaster was so mad that he even slapped his girlfriend in public who was trying to console him, he was later suspended from work for a week or so.
Such a bad experience, any ways the ops did not mentioned what the reaction of the forecaster of this games was, so since the thread did not cover that aspect of the story we may not be able to know what exactly the former did to the later or if the winner decide to gift him some money out of his winning, but regardless of what happens, all that I can say is that, the winner was just so lucky and this can happen to anyone regardless of how long they have being gambling because at some point, only luck will separate the winner from the loser in a bet.