For gambling, big financial institutions will never allow you to gamble because they handle money and their main means of business is money. So if a bank officer is addicted to gambling, he will not be able to do the bank accounts and all the work there properly, he will always be inattentive to work, his mind will be on gambling. No matter what the man says here, he is addicted to gambling, he had to lose his job because of his gambling addiction, if he had not been addicted to gambling, he would have got a verdict in his favor in the court.
So even if his gambling had not involved crypto, he would still have been fired because the bank never allows any employee to gamble and their constitution may not allow it. However, he should have been gambling secretly at home for entertainment.
Gambling is prohibited in financial institutions due to the possibility of harm to the bank and other bank employees by gambling addicts or gambling employees. In South Korea, gambling is not only prohibited in one institution, but gambling is strictly prohibited for the entire country. Even though you are a South Korean bank employee, by engaging in gambling, you are not only violating the laws of the institution, but you are also violating the laws of the state. Gambling is prohibited in many countries of the world and there are strict penalties for gambling. In this case, I do not see anything special about a verdict against a bank employee in South Korea.
It does not matter what kind of currency he uses to gamble, he is a 'gambler', that is enough to rule against him and I think it is right. If he was not involved in gambling, the court would not have ruled against him or it would have been unfair to him if it had been ruled against him.