Those replies are actually pretty easy to get around, most of these little sods can do rudimentary image recognition to solve jpeg Capchas, nevermind just throwing random numbers at a text challenge and keeping a text log of the question / answer pairs.
Really, given we're not a regular wiki and don't really need users who don't know anything, why not ask people to explain what they want to have the account for and manually approve accounts? Sure, it'll mean a backlog to work through, but at least it won't be a backlog to work through and spam to delete.
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