Most of the time people hide because they are doing something illegal, they are afraid of being arrested so they hide. and I believe that this is the case with these people in your country. There is also the privacy side, there are many cases in which a person takes money and spends it and the other people who live with him are constantly asking him where he spends the money and how does he know that if he says the place where he spends money People will criticize him, so he prefers to play it hidden and doesn't say anything to anyone. The problem with this type of bad attitude is that he will be participating in something illegal that when the police catch him playing he will be immediately arrested. Then there is also the side that he may be addicted and in this case the addiction will be on a greater level because no one suspects that he is addicted and consequently he will be treated too late.
While playing the game, it's not something they can bring out in the open; unless they are just playing the WHOT game without adding any money as a bet on it, they can play it publicly.
If they are caught here in my country, they will be arrested. This is because the WHOT game in gambling has been known in my neighbourhood to be one of the forms of gambling with the highest rate of violence compared to other games.
In my country it is also illegal to gamble on the streets and bet money, but if people in my country are playing in physical and online casinos, then it is legal. There's no problem with that. The reason my country's government cited when it banned people from being on the streets in places without a license to gamble is because in those places they won't pay taxes, in those places they could launder money, in those places they could easily fight and kill each other because they didn't there would be no security, unlike the physical casinos in my country where there are security guards and all the luxury to make people feel good, also in online casinos people are safer because they won't fight with each other. now sitting in an abandoned place to play and bet money is a big risk
It is very obvious that the gambling you are referring to is a physical gambling were two people or group of people bet among themselves. The reason why they hide is not far from same reason as I explained which is they don't want people to notice that they are playing gambling because they will see them as wayward people too but I don't encourage this physical gambling because I know the kind of fights and arguments that mostly occurs in this type of gambling so it is not advisable to get physical with gambling just to avoid some embarrassment and quarrels among one another.
at least from what I can see in my country, on any street there are lottery tickets sold, on any street it is easy to see slot machines, there are many local sports betting sites in my country, there are many physical casinos in my country and Most people I see place sports bets and play. So in the case of my country, people don't need to gamble secretly or break the laws because the government of my country is gambling-friendly. Now in countries where religion is the law, then gambling is prohibited, people will gamble in secret because they fear criticism and punishment.