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[Iron]

No, there were plenty of spambots with no referrals. I was checking that, because I wondered if it might be what made some of them purgeproof.

And why would a spambot puppetmaster refer his bots on purpose, thus leaving a trail of evidence?

When you sign up you can say who referred you, so I would guess the spambots simply picked a user more or less at random. Maybe to make the forum consider them more of a legitimate member.