alt Hacker NewsPoW schemes like Anubis don't work. Increasingly bots are using headless browsers and are basically able to solve captchas, proof-of-work(s) and basically bypass all any any attempts to block them. It's becoming impossible to stop bots from hammering your sites/services for unwanted traffic.
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m00dy • today at 5:29 AM
The most recent captchas that involve basic reasoning can block majority of bots today.
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You are asserting that they don't work without explanation or evidence. Meanwhile it isn't clear why they wouldn't and indeed they appear to accomplish the stated goal of severely rate limiting scrapers.