As far as I can tell it's to prevent spam registrations only. Having a captcha after a valid login as well is... indeed strange. But I've never seen it on any login, VM or otherwise. On VM's site right now I only see it under the register link.
---------- Post added at 18:03 ---------- Previous post was at 18:01 ----------
Quote:
Originally Posted by Kushan
Until someone goes on a tirade and blocks loads of accounts just because it's fun :P
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And that's what fail2ban is for.