FiTra and its developer Aleksandr Nefedov does not collect any personal data, but uses third-party advertising services(unity),link for its privacy policy https://unity.com/legal/privacy-policy
       In some cases, the application may send error reports and usage statistics, such as information about the operating system and device model, this data does not include any personal data of the user.
       In the case of purchasing a subscription, the application will use the details of the account to which the subscription is made (for example, Google account details) or email address to provide the purchased services.