Slick Sam Sells You: Plague MD (Patreon)
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So I actually made a video talking about this concept and a more structured plan for what I hope to see out of it, but then I realized it probably messes a bit with the experiment to post videos that aren't in the "Sells You" formula.
We've only done two videos so we it's not a significant sample size, but I expected to see more Assassin's Creed ads on an Assassin Creed video, but proportionally we actually say roughly the same number of them. That means that an individual video likely has very little influence over what ads viewers see. It's possible if I kept playing games in the AC series, we might see more ads, but I think it's more likely that Youtube bases the content you see on its model for you as an individual.
It's also possible that Youtube isn't using as many metrics as we imagine to decide what you'll see, and just sort of applies some broad-level generalizations to choosing your ads and content. It's known that they actually run multiple programs and do a lot of A/B testing.
I'll see if I can get some more information about users, ads, and recommendations specifically and figure out what to do from there.