IMO, there's no law in gambling mandating that a gambler must share part of his winning with eith friends or fellow gamblers in the gambling house, for that, you owe no one an apology either or not you chose to give a penny whatsoever. Let stop the self entitlement claims towards fellows gamblers that won big amount of money. The attitude is disturbing.
That's right, although this may be a way to strengthen friendships in one environment but still basically there is no rule that mandates that every gambler must share their winnings with others including their friends, and for their friends also should not force winning gamblers to share their winnings for any reason, if indeed they don't want to give a penny then don't make this a problem, because after all it's their luck and they are free to use and allocate the money from their winnings wherever they want.
But basically in the real world, this small thing can really be a problem in a friendship environment, especially between those who are fellow gamblers. Honestly for myself I am not too uncomfortable with this kind of problem, usually I will only give one of my friends who knows a sign of gratitude, for example when I get a win then I will give that person a little of the amount I won and if later he gets a win then he will also tell me and give a little of his winnings, but I will not be careless to give the proceeds of this victory to others, and as I mentioned I will only give to people who can also help me when I am in trouble, more or less like that.