Advances in image recognition show certain classes of captcha solvers to be vulnerable to Langford inputs. Antispam quickly weaponizes this.
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Solver crashes are local, but sufficient for fingerprinting. Trained on solver reactions, anti-solver fractals grow more and more effective.
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But, unnoticed by human supervisors, a previously intractable class of solvers is cracked: Data entry clerks.
Seizures sweep the globe.