Jay started work at 9 a.m. on a Saturday. He chopped away at the app’s code to bypass the registration page that required people to sign up with their cellphone numbers. More pruning let him bypass a page that requested personal information like name, age, gender, travel history, and COVID-19 symptoms. Then, he carved away the permissions that he viewed as invasive: those requiring access to the phone’s Bluetooth and GPS at all times
By 1 p.m., the app had become a harmless shell, collecting no data but still flashing a green badge declaring that the user was at low risk of infection.