Not only for the recent spam activity, but it doesn't seem that unmoderated (in the PM sense) content like Tutorials should be posted anonymously.

UPDATE:
Reasons Clarified

• AM's (or other monks) are not allowed to post top-level questions without approval, why should they be able to post something as important as a Tutorial without approval? Tutorial posting without any kind of approval seems to be awful big privilege to leave wide open to someone who won't sign there 'name' to it.
• There is the obvious ability for abuse by unscrupulous outside posters

My suggestion is not to prevent the ability to anonymously post a tutorial (though I don't see a whole lot of benefit in that either), but to at the very least make anonymous tutorial posting subject to approval before appearing to the public.

Title Update: Clarity

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