docs: remove language implying software licensability

CONTRIBUTING.md

@@ -49,9 +49,10 @@ This ensures that references to components are not broken when the page changes
 ### Running your own copy
 
 - point your webserver at the [`output`](output/) folder
-- edit [`sites/privacy.php`](sites/privacy.php) to correspond to your Privacy Policy
 - install and enable systemd services from the [`etc/systemd`](etc/systemd/) folder or an equivalent timer for periodic updates
 
+**Note**: The source code is publicly available. However, for safety reasons, the authors reserve the right to host public instances.
+
 ## Code style guidelines
 
 ### General