I’m having a hard time understanding the use case. Or rather, the extent this can be used. Their example is I can solve a cloudflare captcha and get a “i solved the captcha” “cookie” tonuse later, but they can’t tie that later use to my initial solving. No tracking. But when else would this be useful? Like you couldn’t use this for lobsters.
The use case is that lots of websites use CloudFlare. CloudFlare prevents certain abuses (scraping, DOS, etc.) by requiring some visitors to solve recaptcha puzzles. Tor users share public IPs with Tor abusers, so the large and growing part of the web using CloudFlare is difficult to access, requiring the visitor solve tens of captchas per site (that’s when it’s even possible; CloudFlare has had bugs in this system). So this lets visitors do a captcha that doesn’t also mean being tracked by CloudFlare/Google.