Well Falcrum, we looked into the Diego character, and compared that entry that was pulled out, the designer copied exactly the same eyes, nose, eyes, mouth, etc, so that was conisdered a violation for a copyrighted character, if the designer drew it to look similar without copying the same elements exactly, it wouldn't have been pulled out.
Also, it was based on Mod's voting, not just a one person opinion, multiple votes to make sure that all agree on the same thing before taking an action.
Its prohibited to have any istock / clipart elements that are copyrighted out there, also not to look similar or close to a copyrighted logo and in that case its a copyrighted character and the designer had used the same exact elements in that character, again if he just drew something similar with different lines, the case would have been different.
Best Regards,
Kareem