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by tyoh 1746 days ago
I work in the CTV ad-tech space. Viewership data is highly guarded by every company. It's how every company is trying to differentiate themselves from each other. So, no, YouTube and Hulu etc wouldn't share information.

Ad data is known by the DSP that serves the ad (if the company doesn't serve their own ads), but viewership data is secret as a competitive advantage.