Since GDPR took effect, users are allowed to request service providers to remove or download any content related to their accounts.
Usually, they can contact the website owner to do it. However, this is very manual and time consuming.
Joomla provides an extension called Privacy, which acts as an advanced contact form. The important thing is that it helps website administrators to work faster and more securely.
Admin can see every request and its status to decide next work. Processing (deleting, exporting data) also becomes easier.
For users, when sending a request to the administrator, they need to login and confirm again via their Email, so the security will definitely be higher.
Currently, this feature is available on Joomla from version 2.5 and up. However, it is only really necessary when the GDPR comes into effect. That's why this extension is not known by many people.
There are many extensions that provide similar functionality on JED, but this one is the best in my opinion.