I am looking at the Public workbook sharing and embedding options. From what I understand, Public users cannot make a copy of the worksheet yet. However, the option of “Allow users to copy this workbook” is greyed out and has a checkmark in it. This indicates to me that the option for public sharing is turned on and can’t be turned off instead of the other way around.
Thanks @Adam_Steinfurth this is a known issue (oversight) that we are tracking as issue # 004011. We’ll update this thread once its resolved.