A variety of firms have signed up as customers of these app tracking companies, which include Adjust, AppsFlyer, MoEngage, Localytics and CleverTap, among others, according to Bloomberg. App developers are able to discern whether or not the user has uninstalled their software by utilizing silent push notifications. However, it seems unlikely that many users would deem it fair that an app be allowed to track their devices after they've uninstalled it. It stops social media 'Like or 'Share' buttons and comment widgets from tracking users without their permission using things called 'cookies'. Apple has created some tools to limit advertisers from being able to track users.

Source: Daily Mail October 22, 2018 22:07 UTC