So what would happen if you upload a piece of art but the artist deletes the source but reuploads it again on the same site you got the art from? Would you just change the source or post the new uploaded art the artist posted.
If the image is an exact MD5 match (meaning attempting to upload it would redirect you to the existing Danbooru post), then changing the source is fine. Otherwise, it depends on the image quality of the new source, whether to upload the new one or not at all.
