I don't think so the size could be issue as the last image that i tried to upload on the site was having the following size and resolution
Size is actually an issue. Every server has limited resources or at least the website setting has a size limit to save space and avoid abuse. I don't know what size limit we have in the forum but there must be a number x. When an image exit the size it will not load at all.
Having access over TOR is great advantage for all of us who are using it
I have no idea how many times I had to compromise my privacy with imgur all the past days. It does not work well with TOR. Many of us use the forum in TOR but use clear net to host image. Eventually you are giving away your location and other info to the image hosting site. The forum does not know your location but imgur does.