Jul 5 2017
So the idea, other than just providing the deletion log if a wiki was deleted, is to provide something along the lines of the old Wikia home page with image links to related and big wikis.
So NoSuchWiki no longer uses HTTP_REFERER as browsers don't set this often enough for this to be reliable.
Mar 14 2017
Dec 19 2016
Jul 11 2016
We should consider that the creator/admin isn't going to be the only one looking at a wiki.
This is obviously true, hence why Special:DeleteWiki is staff-only instead of something that'd allow admins/stewards to delete any wiki that they've created.