On demand shows need bought?

Animal kingdom has 4 seasons on demand, but season 4 episode 8 I have to purchase to watch?
We pay for the service to watch on demand when we can’t see it when it is first air’d... why do I have to spend more money just to watch a single episode? Is this some kind of ploy to get me to purchase more stuff from you, because it isn’t going to work. I’ll just skip it and watch the recap. So what’s the deal??