How would advertising on Netflix work when the company isn't completely transparent with its viewership?

The Hollywood Reporter

Advertisers are eager to tap into Netflix's viewership. But, as The Hollywood Reporter's Rick Porter points out, "with advertising comes the need to let advertisers know whether they’re getting their money’s worth. Which means sharing data — something that the streaming world as a whole and Netflix specifically hasn’t been keen on doing." Porter adds: "Publicly available viewing data for streaming programming remains scant, even as most of the big media companies — Disney, Warner Bros. Discovery, NBCUniversal and Paramount Global among them — have incorporated ads into their platforms (Hulu, HBO Max and Discovery+, Peacock and Paramount+, respectively). Those companies all have long-standing relationships with the ad business thanks to their collection of linear outlets, and thus are presumably sharing their ratings for streaming with buyers — even as they keep virtually all of that data away from public consumption. It’s likely Netflix would follow a similar model, continuing its broad but not very deep public reporting but keeping the more granular numbers for partners’ eyes only."