Jeffrey Katzenberg’s mobile-only streaming service Quibi hasn’t even launched, but it’s already sold out of its $150 million first-year advertising inventory, the company announced this morning. The service, which officially debuts in April 2020, added new advertisers Discover, General Mills, T-Mobile, and Taco Bell, who join Quibi’s existing lineup of ad partners, Procter & Gamble, […]