But if you're into it, that's what a subscription is for.
Not everyone uses subscriptions. I was certainly "into it" and I didn't have one (nevermind how much I hate YouTube's current revamp with its focus on the damn things). Hell, I didn't even start watching until 5-6 was released, and I watched 7-8 and the finale in one sitting three days after the latter was released. And of the five other people I know who are interested, three of them haven't even started watching yet while the other two only made it up to 3-4 so far.