Easy way to Remove All iCloud Images?
Using Shift to select multiple photos in iCloud to remove all images - Not Working?
MacBook Pro, OS X Yosemite (10.10.2)
When I needed it I did this:
Duplicated my Photos Library on my mac, opened Photos and deleted all the photos and emptied the trash. I waited couple of hours for apple servers to do the work on an iCloud Library, then I unchecked Photos on my mac from iCloud.
Remember it removes all the photos from you devices linked to that accout.
iCloud Photos is syncing services not backup.