ESET telemetry recorded almost five times more Android stalkerware detections in 2019 than in 2018. In 2020, almost 1.5 times more were recorded than in 2019. Stalkerware is software silently installed by stalkers onto victims’ mobile devices without their knowledge. Many serious security and privacy issues identified in 86 Android apps for the Android platform, provided by 86 different vendors. Among the most prevalent issues were insecure transmission of users’ personally identifiable information; storage of sensitive information on external media; exposure of sensitive user information to unauthorized users.
Source: https://www.helpnetsecurity.com/2021/05/21/mobile-stalkerware-rise/