Datum is a company that plans on changing this by allowing users of its app to extract and backup their user data from various other apps and services and then share or even sell this data.
How exactly do they plan to do this? Why would an app like facebook, for instance, allow a third party to extract the data that it has collected from its users?
I would suggest joining the Slack channel if you have any specific questions regarding how the platform works. It can be found here: https://datumnetwork.slack.com.