Is there any way to improve the matching of ads to the viewer without violating their privacy?
Yes! Contextual Targeting (target based on what I am reading) could work, although the industry seems to be clinging to Behavioural Targeting (target based on who I am). This will become more important for Open Web due to the 3p cookie constraints, regulatory changes etc..., but Google/Amazon/FB are less likely to be impacted. In fact Contextual Targeting predates the current approaches, but it became less important…
On the PG/PMP side, the usage is obvious, but I'm also curious what it will take for publisher-provided data to be trusted in the open exchange environment where historically advertisers and DSPs have tended to not trust the publisher-supplied categorization.