I’m sure they have incredibly granular information about exactly where in a video most people spend their time watching, where they stop watching, where they pause, where they fast forward/rewind, and probably more. As a company which has first-party content, it would be shocking if they weren't collecting it.
Some porn sites (i.e. PornHub) make info about where people spend the most time watching available in the UI in the form of a small graph over the seek bar at the bottom of the video. Even though the adult entertainment and sex work industry has historically been a pioneer of new tech, I don’t think they’re alone in tracking that stuff.
And I’m not thrilled about any of that. I’d be upset if my podcast app started reporting more info. I don’t really care about the specific privacy implications of knowing which podcasts I listen to, but I do care about the loss of privacy in general, especially because some people might be potentially more affected than me.