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A comment on A captcha that requires your computer to solve equations in the background. Parent comment

Re:A captcha that requires your computer to solve equations ... by rocqua on Sunday September 08, 2019 @11:58AM (#20911291)
Besides, if this becomes big enough spammers will just get GPU/FPGA/ASICs to get around this. The imposed cost of 3s of CPU is far from prohibitive.
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