Last month, there was another brouhaha in the programmatic ad world. It was revealed that was a new ad-buying practice was happening and apparently very few people knew that it is going on.

Devised by the ad marketplace Index Exchange and hailed as the latest innovation in programmatic bidding we discovered a practice called ‘bid caching’. New technology that was designed to reduce latency, thereby creating faster ad serving. It was a supposed master stroke by the company,...