According to the Bloomberg report, unscrupulous developers of mobile applications for iOS and Android using Push notifications to keep track of users who deleted their app. Then these users is sent to the remote program to get them back.
For similar frauds use Silent Push notifications, which does not pass the user’s device. With their help the developer can, through certain time intervals to send to the device user’s various requests, for example, to exchange any information when the app is running in the background.
In the case of tracking users who deleted the app, simply send the device a request, the answer to which will signal that the program is still installed. If a response is not received, the advertising ID of the device starts broadcasting promotional messages about the remote app.
Trackers uninstall the app, according to Bloomberg, offer analytical companies like Adjust, AppsFlyer, MoEngage, Localytics and CleverTap. Among their clients: T-Mobile US, Technology Spotify and Yelp.