Leaked pitch deck shows how WarnerMedia plans to become the dominant media company by spending on HBO Max and ad tech division Xandr

· WarnerMedia executives presented a deck to advertisers that shows how parent company AT&T plans to try to become the biggest media company.
· The company said it planned a big increase in marketing and programming to promote its forthcoming streaming service HBO Max.
· AT&T plans to use the combination of its entertainment...