Call me idealistic, but I would rather pay for content whenever I decide to, rather than being spied in order to pay for my “free” content.
Ars Technica recently ran into this, with a major backlash against a Chevy advertorial which wasn't explicitly marked as such. Read the pages and pages of angry subscribers: https://arstechnica.com/cars/2017/07/why-did-chevy-bring-its...