IIRC, they just abandoned it in favour of a host that didn't cover half their articles with advertising. Unfortunately the original host won't just remove the framework of a 'free' wiki, it has to be left there like an abandoned house, allowing any squatters to use or vandalise the premises. So while the framework (sub-domain) exists, deleting the contents by the outgoing owners is a waste of time because the contents can be re-installed at any time by the new 'owners'.