DAN GOODIN from Ars Technica reports:
“One of iOS’ rougher edges are the popups it produces on a regular but seemingly random basis. These popups require users to enter their Apple ID before they can install or update an app or complete some other mundane task. The prompts have grown so common most people don’t think twice about them.”
https://arstechnica.com/information-technology/2017/10/beware-of-sketchy-ios-popups-that-want-your-apple-id/