I just found a group of 4 sprite rips from a VN, which is explicitly against the uploading guidelines. The source field for all of them was "In game sprite" or similar. Yet all of them got approved.
None of the reasons in either the flag or report menus allow for this possibility. When I've seen posts get reported for similar reasons before, the ticket is usually closed with "these posts are handled during the normal approval process", which clearly wasn't the case here. I'm not sure it's a good idea to have any part of the site dependent on the absolute infallibility of its staff.
The posts, for the record:
post #3344846
post #3318033
post #3081766
post #3005505