One of the big changes for developers in iOS 14 is that they have to ask users for permission to track them for advertising purposes, while still being able to collect anonymous statistics to, for example, analyze usage patterns without specifically asking permission.
This is a randomly generated ID code associated with your device called Identifier for Advertisers (IDFA) which is used to track you so that apps can display targeted advertising. It differs from another ID code called Identifier for Vendor (IDFV) which is used to enable ad-funded apps to track, for example, when a user installs an app after clicking on an ad banner in another app.
At WWDC, Apple announced that developers in iOS 14 must explicitly ask users for permission to use the IDFA code. Today you can go into Settings -> Privacy -> Advertising and activate Limit tracking to stop all apps from accessing the code, but many developers have complained that the new rules will catastrophically reduce their advertising revenue as few users are expected to say yes.
Now reports The Information that Apple has decided to postpone the request for permission. The decision must have been made in part after talks with a number of major game developers, including Activision Blizzard and Supercell.
– We want to give developers the time they need to make the necessary changes and as a result, the requirement for a tracking permit will take effect early next year.