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If it is a bot, you need to stop it at signup page. Going after one spammer won't stop other bots. I can recommed you to:
1. Put captcha on signup page with a random background image (distortions won't help much).
2. Put a question on signup page (that you can change anytime).
3. Randomize the table size on signup forms (highly efficient stealth from the bot)
I had the same problem with many bots, but after implementing these three precautions, no bots have managed to break through.
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