~snip~
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.
It's easy to say this but I would like to let you know that sometimes such winning of money comes with huge pressures from the peers and friend of that person and if you start with yielding to the request then it becomes a burden that you yourself cant meet up with so the best option is to actually ignore or snub some unnecessary fake friend because they are still going to be the ones laughing at you after everything has been exhausted.