I realize that in the early days of Internet advertising, tracking and targeting must have drastically increased the value of an ad. But people don't block ads

I realize that in the early days of Internet advertising, tracking and targeting must have drastically increased the value of an ad. But people don't block ads just to block ads; they do it for specific and usually well-founded reasons, and one of the biggest reasons cited is tracking. With up to half of Internet users now blocking ads and cookies, surely tracking must have more than cannibalized its own value by now.