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"Behind closed doors, publishers are venting their frustration, upset that the watershed moment they’d hoped for, when they’d finally see their inventory used transparently, never came. Instead ad fraud costs continue rising." adexchanger.com/the-sell-sider/why-ads-txt-has-failed-and-what-to-do-about-it/?__s=8qf3yfxni7pj47w1cdja