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\subsection{CAPTCHA farms}
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CAPTCHA farms are run using cheap labor available in third-world countries. When
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an attacker seeks the services of a CAPTCHA farm, they are provided access to a
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web API to forward CAPTCHA challenges. A labourer working in the farm solves the
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CAPTCHA and the API responds with the solution. The whole process takes less
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than a minute to complete and costs only a fraction of what premium services
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like reCAPTCHA charge.
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Overall, this attack is very feasible and cheap and is frequently used to bypass
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traditional CAPTCHA systems.
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%% TODO insert price charts
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