Hi Dyslexicon,
Thanks for contacting Apple Support Communities!
We understand that you'd like to remove the "Shared By" option from your shared folders in iCloud, correct?
You can manage how the files are shared but, removing "Shared By" isn't a feature as outlined here: Share files and folders in iCloud Drive on iCloud.com - Apple Support
"Manage sharing if you’re the owner
If you own a file or folder, you can manage participants and sharing settings.
Note: You can’t change the sharing settings for an individual file in a shared folder. You must change the settings of the folder.
- In iCloud Drive on iCloud.com, select the shared file or folder.
- Click
, then do any of the following:
- Add participants: Click Add People or Send Link.
- Remove participants from a privately shared item: Hold the pointer over the person’s name, then click
and choose Remove Access. - Edit sharing options for a participant of a privately shared item: Hold the pointer over the person’s name, then click
and choose an access level (Can Make Changes or View Only). - Edit sharing options for everyone: Click Share Options.
- Copy the link to the shared file or folder: Click Copy Link.
3. Click Done."
Feel free to share any ideas about iCloud features you'd like to see with Apple directly here: Feedback - iCloud - Apple
Take care!