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Those YouTube ads everyone hates made $10.4 billion in just three months
(www.pcgamer.com)
This is a most excellent place for technology news and articles.
I think your theory is plausible. On the YT smart TV app, the ads seem to be increasingly about unpleasant things like dick pills, period pads, and constipation treatments. I think they literally serve up unsavory ad content as a way of punishing you into shelling out for a subscription. Jokes on them, I just switched to SmartTube.