This question already has an answer here:
I requested Imgur to remove a copyrighted image on the Imgur website which was originally posted on Math Stack Exchange.
This request has been ignored for a long time now. This image has been removed from the Math Stack Exchange question but is still existing in the link http://i.stack.imgur.com/... . Even the Stack Exchange help (contact form) has been unanswered yet. How to have this image removed?