In my opinion, if we talk strictly about the concept of “hobby,” there is still a difference between such hobbies as collecting stamps or baseball cards and such hobbies as gambling. This difference still manifests itself in relation to your passion for gambling. If previously unknown people find out that you are interested in collecting stamps, and this is your hobby, then the attitude towards such a hobby is still more favorable than if these people find out that your hobby is gambling. In the second case, strangers immediately develop some negativity towards this hobby of yours simply because gambling has long been classified as a wicked hobby.
By the way, all this must be taken into account when you tell strangers about your hobbies.
Those hobbies is different than gambling because when we spends our money to buy stamps or baseball cards, we have the physical thing that we can save in the album. We can also sells the stamps or baseball cards or exchanges with other fans with the other things. We can gets something from what we collects so that still gives benefits to us.
But when we use gambling as a hobby, we spends the money to playing gambling but we don't have a big chance to wins the money. We will loses that money in gambling while we can't recover our lost in gambling so that can makes us bankrupt if we don't have self control and use limitation when playing gambling. We must not use gambling as a hobby because that can gives us a big problem that we never imagine so it will better if we use gambling for have fun.