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.
Not for bitcointalk I believe. We already use Tor routing which means for the basic protection level on CloudFlare, we doesn't require a CAPTCHA challenge. The traffic goes straight to the CloudFlare Onion address. The CAPTCHA re-appears when you have an elevated protection level.
If your site doesn't have the CF onion routing function enabled, then it would go through the exit node and this behavior would be normal.