So I'm having this "whoa, wait, what?" moment, but aren't the accounts here and there linked? Or am I just like... crazy?
On my personal wiki at stenoweb.net/wiki the thing I did that ultimately stopped the spam accounts was to disable editing of pages by nonregistered users, and then to disable account registrations.
I already more or less did that to the phpBB side of things, and it sounds like not necessarily every forum registrant wants to edit things on the wiki, so we could just turn off registrations and make it so that somebody has to contact you or I (a wiki sysop, basically) in order to get an account created on the wiki.
Thoughts? I don't know *that* much about wiki (or phpBB2) security, just what I did on my own wiki, which has 100% completely stopped spam. (but it has also stopped a lot of the helpful types of adhoc contributions that are actually helpful, since to edit an account must be created by me.)