The WarnerMedia and Discovery merger ends AT&T’s $ 85-billion bet on becoming a major TV player, but the telecommunications giant still has to grapple with the future of another multi-billion-dollar business unit. AT&T bought AppNexus, a preeminent name among early ad-tech companies, for $ 1.6 billion in June of 2018. Out of that came Xandr, a full…
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