Perhaps you do not have GDLib installed?
There's a lot of plugins that have spambot countermeasures. Some of them are during the registration process (NoSpam!) and some are after the registration process.
I'm developing a plugin that scans the first X (usually 1 or 2) posts of a user and look for "clues" that might make the user a spambot, and then it takes certain actions.
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