Despite the industry’s efforts, low-quality supply continues to be a regular component of the programmatic supply chain, according to July’s Jounce Media report, which found that top supply-side platforms (SSPs) often sell as much inventory from premium publishers as sub-premium. Inventory classified as sub-premium includes made-for-advertising sites, non-viewable ad placement, and inventory that could only…

(SOURCE) https://www.adweek.com/media/why-major-ssps-monetize-the-majority-of-the-webs-low-quality-websites/