Thirteen Years Of Ad Tech Progress In One AdExchanger Comic | AdExchanger
Briefly

"Sure, DSPs had the transparency and flexibility the ad networks didn't, but they also had a fraction of the inventory access they have today. I'm glad we got over this. The DSPs won. Now, instead of ad networks with limited transparency, we have enormous walled gardens with opaque algorithms that ... aww, man."
"The idea of using view-throughs as an attribution signal - in which an ad is given credit for a conversion if the end user only saw the ad but didn't click it - is anathema to an ad network that sells clicks."
Read at AdExchanger
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