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Cloudflare's solution is not a CAPTCHA. We have a ton of stuff going on that detects bots. CAPTCHAs are a small part of the tools we use. https://blog.cloudflare.com/cloudflare-bot-management-machin...

Sorry. I didn’t mean to imply that you don’t have anything but CAPTCHAs. My wording could’ve been better.

Do you have a scraper that looks for mentions of Cloudflare or did you just happen upon this?

Yeah. I use something like this: https://github.com/jgrahamc/hncomments

Although I really need to commit the final version as that one isn't quite what I use.

Cloudflare uses CAPTCHA to drive away proxy users. Privacy conflicts with Cloudflare's endgame of profiling every Internet user and then monetizing that data.

An attack-resistant trust metric? Although I haven’t seen them used against denial of service attacks.

Generally you don't. Just be prepared to scale resources and handle everyone.