What causes a Captcha?

Dimension

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Does anyone know what causes a captcha to take place? Is there a specific number of HITs that one works that causes this issue or is random?
 

jan

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Does anyone know what causes a captcha to take place? Is there a specific number of HITs that one works that causes this issue or is random?
Do you mean in the hit itself? Or when you are doing batches?
In the hit, no. I didn't think so (just bot prevention, I thought).
 
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