When a user installs an application, they do not know a priori how their personal data is processed. This could cause distrust and they may proceed to uninstall the application.
Carrying out an audit of an application guarantees its maximum possible security, since all the vulnerabilities found at the time of carrying out the audit can been found and fixed. This will prevent malicious user or threat actors from having unauthorized access to user data. Therefore, security in mobile applications is vital to comply with regulations on personal data processing. The testing will make the users feel safer and more confident of the application, knowing that their privacy is well protected by the developer.