And to be more explicit, quoting the paper in case someone really has
doubts: «we deem a captcha scheme broken when the attacker is able to
reach a precision of at least 1%». With our FancyCaptcha we are/were at
25 % precision for attackers, so yes, it's officially broken, and it's
been so since more than a year ago
so surely spammers got better in the meanwhile.