Sites routed through CloudFlare are practically unbearable to use over Tor and ReCaptcha 2.0 has actually made things worse. The new challenges take more time to solve and most times you're required to complete multiple challenges before being accepted.
I'm glad to hear that this is being worked on, but I'm pretty pessimistic that there will be a good resolution. There seems to be a fundamental conflict of interest between preserving anonymity and being able to identify potential abuse. As CloudFlare grows and absorbs more and more of the Internet, the inconvenience and potential for tracking will only increase. The problem is really more of a structural one than a technical one - this is what happens when one entity controls vast portions of the infrastructure of the Internet.
I'm hopeful. The more we do abuse detection by intelligent means the more we are able to spot abuse without using CAPTCHAs or other tools like that. We are about to allow our customers to whitelist Tor so that sites that want an immediate solution for Tor users can disable the CAPTCHA check.
I'm glad to hear that this is being worked on, but I'm pretty pessimistic that there will be a good resolution. There seems to be a fundamental conflict of interest between preserving anonymity and being able to identify potential abuse. As CloudFlare grows and absorbs more and more of the Internet, the inconvenience and potential for tracking will only increase. The problem is really more of a structural one than a technical one - this is what happens when one entity controls vast portions of the infrastructure of the Internet.