Even if they consider gambling as a hobby, the majority of the gamblers do not treat gambling as a hobby. Hobby is something that is done in leisure time and for fun but most people will gambler for money and they are in mental pressure to win and become in stress when they lose. This behavior may not be with all the gamblers but those I know has the same feeling.
When you ask them verbally they will say that they treat gambling lightly as a hobby but in fact they are too emotional to get some money out of it and not lose the money.
In addition to considering gambling as a hobby, they can also say that gambling will make money even though sometimes it cannot be predicted or as a surprise for those who do it.
And even worse, if the person carries out gambling without limiting each time they play, it is likely that they will feel regret due to being too excessive in playing, yes, at first they will feel happy but slowly they will feel sadness and regret due to losing a lot of money and only then will they make the right conclusion.