Hmm, did the person who helped him really not know that the person was a gambling addict? It seems that the person who asked for help used a clever way to ask for help from others in financial matters so that people believed and gave him some money, because if from the start he said that the money was for gambling then I'm sure no one would want to give it to him unless there was a strong reason.
But on the other hand, looking at the results, yes, it was good, he was really lucky in the experiment so that he managed to win a fairly large amount, if I were on the side of the giver, maybe there would be two reactions in me, between being happy to see the victory of the person I helped or being disappointed because he was not honest that the money would be used for gambling.
But it’s more on the giver may feel disappointed on the gambler since he was not honest in the first place, and it might be hard for him to trust the gambler again. Most especially that gambling is against in his values, he will definitely won’t give the gambler a chance again to fool him, even if the gambler managed to win his bets. This is not about winning, but it’s actually being true to the person that helps you.
You need to understand it clearly. The person has requested a little financial help, and he hadn't requested assistance in picking the odds. He hasn't got much knowledge in gambling, which shows it was his luck that had got him big money. As he had provided with little money, he has insisted on going with a particular choice, and the receiver has chosen on his own, and the same has won. Here there is nothing to talk about trust, because while receiving the money, he hadn't said any other reason. He has mentioned the right reason and got the money and gambled, which means he is true to the person from whom he has got the money.