This isn't for the whole of Google's ad business. Just its ad exchange and I think parts of DFP; basically just mechanisms for auctioning off excess display ad inventory.
Thanks. I was trying to figure out exactly what's in scope here. I'd love to get a broad breakdown or a big pie chart that goes to this level of granularity so I can see where this sits within its other 'non-Google-property' ad businesses.
You’re partly right. It’s indeed mostly about AdX but also because Google owns all three sides of the equation (publisher-side via AdSense (and to a lesser extent DFP), AdX, and buy-side via Google Ads)