Hi Anh,
Could this be used to restrict users to accessing their own upload directory/files in the Media Library, an often requested feature in many forums.
The concept would appear to integrate nicely with all the Metabox upload fields, for example:
https://docs.metabox.io/fields/image-upload/
where the array attribute 'upload_dir' uses/creates a "home" folder which could be a user's wordpress ID or an secure, unique algorithmic hash.
Thanks,
David