I think OpenID
is a great way to consolidate identities across
multiple wikis, and to identify contributors semi-formally, however,
if OpenID providers are easy for spammers to infiltrate, I'll have to
rethink the whole approach.
(Spammers can easily be their own OpenID provider.)
In which case the provider could Nuke by provider :)
Just as many forums reject some common email providers (even though I
don't consider that an acceptable solution).