Comment 1 for bug 541683

This behaviour comes from the software used by the wiki, MoinMoin. I don't know much about the technical details but it seems that it is done this way to avoid excessive load on servers. See the discussion here: http://moinmo.in/FeatureRequests/AlternativeSpiderControlFeatures

I'm closing the bug on ubuntu-website as this depends on the upstream software. To develop this issue further I suggest that you get in touch with the MoinMoin developers and continue the discussion there.