Logging in is not the issue that Royse777 is talking about. That is using reCaptcha, for which there is already a workaround but this one that OP is referring to specifically is when you try to open any page on the forum, but you can't because you see a Cloudflare screen that never goes away, even if you complete the captcha 10 different times.
The Cloudflare blocks are IP-based. Doesn't stop them from banning all tor exit nodes though.
Thanks for the correction. It seems that is the problem that Royse experienced some time ago.
Is IP blocking by Cloudflare related to the following?
Due to the behavior of some individuals using the Tor network (spammers, distributors of malware, attackers), the IP addresses of Tor exit nodes may earn a bad reputation, elevating their Cloudflare threat score.
Our basic protection level issues challenges to visitors whose IP address has a high threat score, depending on the level chosen by the Cloudflare customer.