When someone is trapped in a cycle of addiction, half of their common sense is gone, especially when they are playing and that is the reason why they often do not hesitate at all to do unexpected things, borrowing money, cheating or committing crimes such as theft has become something that is quite common for them to do and the most common is usually selling various items that they have and all of that is done without them realizing it until in the end they usually only realize it when they are depressed and various financial problems befall them. In simple terms, yes, that can be used as a sign that the person has been trapped in an addiction, the point is that the inability to accept defeat and being obsessed with winning is the perfect form to be used as an excuse that they are addicted.