And even though such cases are few, it is nevertheless always unpleasant when someone tells you that he had his own opinion, but decided to listen to you, and because of this he lost money.
That is the perspective of someone from the opposite side now what if they don't even blame us but just let us know that they wanted to bet on X but they also decided to bet on team Y because I am going to bet on them can create some guilt on ourselves that is why better don't discuss at all with others prior our betting and then it is okay to discuss how much they won with the closed group but there's another view of jealousy comes in play if I won and other party lost and over time it can also lead to hate crimes and many other things.