My thought is that there's a correlation between attention and a viewer's willingness to spend money that can be seen without directly looking at revenue. For i

My thought is that there's a correlation between attention and a viewer's willingness to spend money that can be seen without directly looking at revenue. For instance, letting a music playlist run would look a lot different than watching a video I'm actively paying attention to. Or a detailed discussion on credit card churning would probably be more niche than a clip from SNL. But former would probably have a more engaged audience and be more willing to act on an advertisement for a credit card. So if you're optimizing for user engagement, you'll probably increase profit.