So Google should get to 1 out of 3 pretty quickly.
My 7yo son is obsessed with the whole Let's Play phenomenon, and other associated minecraft content. I've looked up some of these people on Social Blade[1][2], and some of these people are likely making millions, but I can't fault the system. While the content of some isn't exceptional, it is professional, and some of these people keep up that pace for multiple content releases each day.
It's quite scary actually what the current and future generations are being conditioned to do.
It's true that you can binge on a series if you are new to the series (youtube or otherwise) but if you are up to date that is no longer the case.
I don't think I could have resisted the compulsion to be on YouTube for all of my free time. I am lucky that there is a ton of social pressure on me to spend my time doing other activities.
It could be a personal problem, unique to me and a small amount of other people.