INSTALLING APKs AND POSSIBLE DISADVANTAGES

APK, known as the abbreviation of Android Package Kit, is the file format of mobile applications used by the Android operating system. Such files can be offered to users from application stores such as the Google Play Store.
Under normal circumstances, it is not a illegal to install APKs for reasons such as regional restrictions or update problems. However, it is very important to find a platform that you are sure of its security as we can say that APKs installed outside of stores such as the Google Play Store do not pass any security checks. Therefore, it is important to have an Antivirus program on your device. Otherwise, it is highly likely to download an infected application.
Source: https://shiftdelete.net/apk-yuklemek-suc-mu-yasal-sorumluluklari-neler