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We won't mind a bit.
As it turns out, there was an exploit with the captcha module by which it could be easily defeated by spammers.
See security notice Captcha - response validation bypass.
I ended up in a discussion with Heine about a bypass that is fairly trivial to use. Captcha has been updated to prevent the exploit.
New versions:
Captcha 4.7.x-1.2
Captcha 5.x-1.1