I would actually be on-board with such things if this were against abuse but it's not -- it's preemptively assigning blame, since my copy of Firefox is not modified in any way except uBO but CF loves to captcha it. The other stories in every one of these captcha threads, and the majority of the CloudFlare announcements at all, demonstrate this isn't isolated to "oops, our bad" but a systemic problem
If I were DDoS-ing some site, I deserve every ban I get, but just browsing via the provided navigation links on the site shouldn't "pardon our interruption" or gatekeep