^
I'm sure the main reasons for this irresponsible behavior are gambling addiction and alcohol. But it is not quite clear to me why this person did not find the strength to seek help from specialists. After all, as I understand he had enough time between gambling sessions to analyze his behavior, make some conclusions and take measures in time. Instead of fighting with gambling addiction he continued to play gambling games pouring alcohol on his failures. Very irresponsible behavior in my opinion.
I am 100% sure that these are far from the main reasons and not reasons at all, these are consequences of other things that happened to him (maybe a tragedy in the family or something else). The owner of a multi-million dollar business is obviously a disciplined, rational person who has seen a lot in life. If he had been exposed to alcohol or unreasonable risks, then he simply would not have achieved what he achieved. The part of the story that we learned is only part of some other story that led him to this.