A work-based CAPTCHA. If a robot or crawl wants to hit the API endpoint or crawl the site, it must give a large number of CPU times, this make them hardly to get the job done
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CAPTCHA has always been a complex problem, and with the development of AI, it is now increasingly difficult to identify whether a client is a human or a machine. This tool has a different way of thinking about CAPTCHA: we don't verify if a client is a human, we only verify that a client is a "normal" user. A normal user only has to pay a few seconds of CPU time to continue accessing the site, while for a crawler or robot that wants to send a lot of requests, it has to pay a considerable amount of CPU time. This way we can see the distinction between normal users and abnormal users.
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