To limit vandalism in the app, we should consider a blocklist of images before displaying them. There is a list here:

https://en.wikipedia.org/wiki/MediaWiki:Bad_image_list

that is exposed via the badfile property of the imageinfo MediaWiki API call:

https://en.wikipedia.org/w/api.php?action=query&prop=imageinfo&titles=File%3ACho_Seung-hui_3.jpg%7CFile%3APainted_white_brick_wall_(Moscow)_02.JPG&formatversion=2&iiprop=timestamp%7Cuser%7Cbadfile%7Curl