Sell-side ad tech (ie. DRX) doesn’t make much money for Google, relatively. If Google likes AdX why isn’t YT inventory on it? Because they actually like the buy-side tools. Sell-side gets basically no love, no real fresh ideas. I say this having the utmost, deep respect for Ad Manager/AdX’s current and former eng & product leaders.
What happens here isn’t about market dominance, no one is thinking that. They already killed the display publishing golden goose, by Google standards there’s nothing to dominate in pub ads the business died. It’s a small market, now, putting display ads on other people’s websites. Big business is O&O which exploded around it, this is obvious.
Projects like this are about two forces colliding: smart engineers without a deep understanding or connection to the publishing industry and an internal org losing relevance/importance as its size relative to its peers decreases.
IMO, (this is definitely just my opinion) the real real problem is none of the ads you can by through AdX actually work. Using OA a lot leads to users tuning out your ad units because they are often really weird or bad-quality & register as noise.