<p></p>
<blockquote>
<p dir="auto">Is this or previous spam wave some share characteristics of accounts that could allow to detect or target malicious users, beyond blanket suppressing of automated account creation?</p>
</blockquote>
<p dir="auto">What exactly do you think I've been doing for the last few weeks but trying to apply such blocks - options are limited when faced with a determined attacker.</p>
<p dir="auto">A captcha is unlikely to help with the recent issues anyway as we long since stopped them doing bulk account creations and they now only create two or three at a time which can be done manually.</p>

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