That tech was then modified and used to execute the Zero Day attack. In Episode 6, Pennington (Jay Klaitz), a Zero Day Commission employee, lays out exactly how the malware spread so widely. Tech billionaire Kidder (Hoffmann) pushed it through automatic updates to her app, which was “downloaded on 80% of the phones in America.”

https://www.netflix.com/tudum/articles/zero-day-ending-explained