In the settings, there's an option about what to do when the StopForumSpam server is unavailable. I think the default is to allow registration since usually there is another layer of protection by new users being placed in a moderated group, and you don't risk blocking legit users. You can change that if you wish.
Quote:
StopForumSpam: Query Connection Errors
What should happen if the remote connection times out when querying the new registration?
* Note: Only applies if set to block listed registrations in the above setting
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