I think that the most time the life makes you change your habits. But the same time you get another ones. So you don`t lose your hobbies but only replace them. And when you become an old one - you have some fun to remember. But i can`t say that it is interesting thing to remember how you watched someone`s gambling.
I know what you mean but a great deal of the content that you can find these days on those websites is content to be consumed right now, but that overall has no value at all when you think about it from a long term perspective, in a way this is similar to junk food, healthy food will have a good effect over your health and many other aspects of your life, but junk food is available everywhere and it may taste better but over the long term it is bad for you.
It is interesting to eat some junk food sometimes. But it doesn`t mean that we can eat it every day. The same is with the streamers - i don`t think that it is a problem if you watch it sometimes(i watch different bloggers on youtube but it takes about 1-2 hours per week and mostly when i`m eating). The problem when you can`t stop watching it. Of course everyone can do what he wants, but i don`t understand how someone can spend so much time for nothing.