Each data project can have several admins. The admins are authorized to delete the data project.

To do this, you need to open the info page of a data project. The option is located at the bottom.

After you click "Delete Dataproject", you will be asked to confirm sending the email. This counts as authorization. You will now receive an e-mail with a signed link. 

Call the link and confirm the deletion.

Now the data project is deleted.