I've got this thing where my mind generally goes on walkabout during YouTube ads, presuming that they're all scams.
This is, of course, a presumption, and my skipping past them doesn't go down the rabbit hole of how they work.
Dan Olson doesn't presume, he dives deep and exposes the scam. I mean, I knew, but it was interesting to learn the means they go about it with. And, done properly without malevolent intent there's some good ideas. I found it worthwhile.