The answer is simple , people move to where the grass is greener... and like they say, it is greener on the other side. In this case, I presume that Indonesia has a weak gambling regulation so people are taking advantages of the loopholes to operate illegal casino because of course there is money in it.
If regulation was what actually pushed them to move to another country to do an illegal gambling business, now they have been caught and will also still face the same punishment and might also face more fines, like being banned from ever entering the country again.
Another thing some of these criminals also don’t consider is that the more they are being caught, the more likely they are to paint the image of their country as bad, which might put them under tight surveillance each time someone from such a country side visits. Indonesia.
What I can say regarding this is that they are conducting their illegal operations in various countries during their scheduled timeframe or months, allowing them to evade law enforcement since they are inherently criminals.
Therefore, to remain out of the radar of the police, they opt to shift from one country to another to run their dubious online gambling service.
That will cost a lot, and if they are operating in different countries where they need to be physically present, they will have to be moving around more often., and might have not had any reason to request for the extension of their visiting visa which was said to be among what lead the authorities to investigate them.