with gamblers who like to publicize their gambling activities, in my opinion they are people who are hungry for praise, whereas they don't first see what they are doing, because gambling is something that not everyone likes and there are also people who think that gambling is is a negative thing so it's only natural that they publish it and get criticism from other people because not everyone has a good view of gambling. By publicizing the gambling they do, especially when they win, it shows that they are thirsty for praise from other people, including their friends.
Yes, there are people who wants to boost whatever they are doing and like what you said, they want praises from people who are monitoring them, especially when they are sharing winning streaks and achivements, though there are negative comments as it's not going to be away but those who loves to share not minding those things they just wants to continue and let those who admired them to be delight with what they are sharing.
It's good if the perpetrators who like to publicize their gambling activities are not easily carried away by their feelings, maybe they won't hear the criticism they receive, but if the people who publicize their gambling are easily carried away by their feelings or easily offended, there may be conflict, but the ones who are at fault are those who publish his gambling because as I said before not everyone has a good view of gambling. Therefore, it's best to just keep it a secret even if you win, it's better to just keep quiet and enjoy it.
It's best to keep it secret if you are affected by those who criticize you, but if you are not minding anyone and you just mind your own business I guess you'll continue sharing and will continue to be like that.