User blog comment:Jmcdavid/Anonymous Users - Why Are They Still a Thing?/@comment-1733689-20161111181118

There have also always been vandals that weren't Anonymous, in fact it's those users that I first remember being vandals. However I have had the same concerns that you know show, and Admin PhazonAdictKraid reported the issue to the Wikia Community, and so I do believe we have the option to turn of the anonymous users.

However we also can protect pages so that "New and Unregistered Users" cannot edit, which is why some of the more important pages here have remand untouched. Which keeps a lot of vandals at bay. So I see no difference whether the vandals are anonymous or logged in, both are acting against "Children's Online Privacy Protection Act".

And we turn of the anonymous, then more casual or just shy users who aren't sure If they wan't to make an account, we deny them the opportunity to "test the waters" so to speak.