Yes, no one at the advertising agency is going "let's make sure each person gets relevant ads." They are saying, "let's make sure we can charge more by assuring

Yes, no one at the advertising agency is going "let's make sure each person gets relevant ads." They are saying, "let's make sure we can charge more by assuring the buyer that their ad went to the demographic they asked us to show it to." They need to track so that they can "prove" they did what they sold.