Google limits which apps can access the list of installed apps on your device
Apps on Android have been able to infer the presence of specific apps, or even collect the full list of installed apps on the device. What's more, an app can also set to be notified when a new app is installed.
Apart from all the usual concerns about misuse of such a data grab, the information can be abused by a potentially harmful app to fingerprint other installed apps, check for the presence of antivirus, affiliate fraud, and even for targeted ads.
In 2014, Twitter began tracking the list of apps installed on users' devices as part of its "app graph" initiative with an aim to deliver tailored content. Digital wallet company MobiKwik was also caught collecting information about installed apps in the wake of a data breach that came to light earlier this week.