In fact, it doesn't matter if you experience addiction in other things, especially those that don't have the possibility of risk, but if you experience excessive interest in gambling, which means you have entered the addiction phase in gambling, it is clear as you say that something that has the potential for adverse effects that can harm someone can no longer be said to be a hobby, However, a hobby is something that is usually done when someone has free time and does something they enjoy to please themselves, but if for example the activity has an element of addiction which on the other hand also has the potential for harmful adverse effects then it cannot be said to be a hobby if someone has experienced dependence on activities that are harmful. On the other hand, I understand that gambling can be very enjoyable and entertaining, but it cannot be a hobby for everyone because of the possibility that gambling can turn pleasure into stress and tension along with many other problems.
But I think overall if you think using common sense and a rational point of view then you will be able to see that in the end making gambling as a hobby can cause problems, and all of that is because of the temptation in gambling which can look very tempting which in the end becomes clear as As time goes by, there is a possibility of a change in someone's mindset who initially thought that gambling was just for fun and as I said before, when gambling is no longer fun then it cannot be called a hobby because in the end it will lead you to many bad impacts.