1. Support from the government.
Countries who gamble a lot has solid laws protecting their players so gamblers in those countries can just freely gamble as much as they want without having to worry about their rights. This doesn't mean that the countries have very free and loose rules but it just means that they have clear frameworks. Some other countries have some limitations but since their rules are clear, many still gamble.
Let me add this for you
No economic support from the governmentIn a country where the citizens, especially the active Labour force struggle for survival due to lack of employment opportunities, lack of basic amenities and little or no incentives or credit facilities to motivate and encourage young entrepreneurs and business people, a good number of the citizens will gamble for money whether the government supports them or not with some good gambling regulations.
One thing about these governments that don't support their citizens economically is that no matter the hardship, they will legalise gambling so they can generate revenue from these gambling platforms. Apart from that, there is nothing much they do again. Corruption is just the norm over there. Sadly, quite alot of poor gamblers are addicted, yet nothing is done about it.