Of course, every religion prohibits things that can harm oneself or something that tends to have a bad impact on oneself. But there are always people who break these rules and it is very difficult to stop them. Stealing is prohibited in religion, but thieves always exist in this world. Adultery is prohibited in all religions, but many people do it. These are all decisions that have an impact on every individual regardless of religious rules that prohibit it. Of course there are consequences to why it is prohibited, but you can't stop it.
The point is not about to stop other people to gamble, but it's start by yourself. So, is your religion prohibit gambling? if yes I want to know the reason why you're still become a gambler.
Yes, that's what people do when they want to gamble, where they will only check the regulations of their country even though it is clear in their religion that gambling is clearly prohibited and should not be done.
I doubt it, most people don't care about the terms of services, even the casino has given a warning message if they can't accept citizen from that country, people will use VPN and access the site.
Some people accept religion because they have failed in every aspect of life and they find refugee there in religion.This though gives them a certain self esteem and they start trying their activities that maybe they did before entering a religion,namely gambling.They continue to play there as they feel the desire to do so and religion is just like a turtle house which shields them from further misjudgment from people,they do it online and in real "life" they go to church or mosque for example.