> The current price for solving a js captcha is $3/1000 https://2captcha.com/ https://2captcha.com/ . The cost of cpu time for your PoW captcha is probably much

> The current price for solving a js captcha is $3/1000 https://2captcha.com/ https://2captcha.com/ . The cost of cpu time for your PoW captcha is probably much lower. The cheapest AWS instance I can find with a dedicated CPU costs $0.000565 per second. So running four cores for two seconds already makes it more expensive — and much less effort and time for a human to solve than a traditional CAPTCHA. > It might stop the really low effort attacks of people who are spamming billions of pages where the cpu time becomes expensive, but i don't think the ecconomics work for most scenarios. How are regular CAPTCHAs any different if they cost $0.003 for an attacker to solve?