I guess I am not the only one or am I? For last a few days when I try to access Bitcointalk with TOR I continue to redirected to Cloudflare human checking window. I was in the same loop for the last a few hours today too and now I had no way but to buy a VPN and posting this topic using the VPN. I am not a VPN friendly person. TOR is my trust.
Privacy is number one priority and if we can not use TOR then we are compromising it. I think Cloudflare is not a solution anymore. The forum has enough money to invest in forum related issues and this is a major issue. How long we will need to wait for some technology that can replace the annoying experience with Cloudflare?
You might want to hear the side of the forum administration as well, a thing like this can't happen without a reason whether you like it or not. Tor has an issue of its own to the point that verification is often difficult which is certainly not the fault of the forum in my understanding, it's a middle connectivity bridge for security reasons. Also, I know that many things could be happening which makes the forum decide on the verification which was not there before. This may not be limited to DoS attacks, but they can't be telling us all these all the time.
Have you tried this on other websites? Because many serious and reputable sites are now using this verification as a procedure, it's not peculiar to Bitcointalk, anything security shouldn't be taken for granted. If you try it on Tor with other websites, I can assure you that you will experience similar unending verification issues. Besides, there are good VPNs out there, if they can solve this issue for you, then it's not a big deal anymore, they are equally safe. Bitcointalk is not where we keep our money to have warrant such a huge fear you portrayed.