Hello. years ago my site had this issue, and we installed several methods to stop them wish have been almost 100% successful. First is the question option (can't recall if it's a vB default or a mod), various questions in the registration forum that are related to my site (sci-fi based).
However we found the most successful method is to actually have admin authorize the new users and compare their IP and email off spammer lists. It's a length procedure at times but an effective one.
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