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Holding other people's money and using it for gambling is a wrong practice and is influenced by the desire to make money bigger. But in the end they experienced conditions beyond their predictions and the money was used up for gambling without control. Whatever the reason, taking other people's money and using it for any purpose is still wrong, unless we get permission to use it, even though in the end we lose the money due to misuse.
It was more of an addiction and he used the money to gamble without thinking. When someone is addicted, it will be much more difficult to control themselves, especially if they use other people's money. This must be avoided because using other people's money will be very risky to lose and we will have problems in the future.
Greed and heavy addiction as well as high self-confidence in uncertain opportunities have made many gamblers lose the rationality of their mindset towards gambling. They make too risky decision about money, meaning they fail to think rationally about what the impact would be if they lost when they used other people's money.
It is absolutely not recommended to use other people's money to fulfill gambling needs, and it is not even recommended to get a loan to be able to gamble. My friend has felt the consequences of his serious gambling addiction, of course now the result is that he has to hide from being chased by the collector's department due to failing to pay his online loan.