Ads that are not in context, do not convert, unless they appeal to a majority (e.g. the big brands). Note that ads can still be targeted, except that the artic

Ads that are not in context, do not convert, unless they appeal to a majority (e.g. the big brands). Note that ads can still be targeted, except that the article's context (or whatever the user is looking at) can be used instead of the user's profile and you're not violating anybody's privacy. And on the web this works great due to the long tail, available articles, movies, searches, etc. telling you a lot about what the user wants, without having to profile that user. It's not like on TV where the content has to appeal to a wide demographic, quite the contrary. The problem with ad exchanges is that they are designed to violate the user's privacy by leaking user data on purpose, like the user's IP address and now with GDPR they rely on good actors, because the ad exchanges can't control who gets that data based on consent, with the threshold for vendors signing up being really low.