Big money very often has a negative effect on people. They become arrogant and stop communicating with those who seemed to be friends with them before they had money. In my opinion, this is not surprising.

On the other hand, if the common interests of these people were only in gambling, then this lucky person simply decided to stop communicating in order to leave gambling as a winner and break all ties that can be associated with gambling. It seems to me that this is very likely to be true.