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Re:A captcha that requires your computer to solve equations ... by crave_ on Sunday September 08, 2019 @02:23PM (#20912329)
It's a hashcash:

https://wehatecaptchas.com/load.php?name=captcha-worker.js

Proof of work is trivially parallelizable, and 2^(5*4)=1048576 options are super easy to go through for spammers.

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