They specifically built controls so that web sites can remove CAPTCHAs for Tor users completely.[0]
They also do not block/CAPTCHA Tor users automatically. They treat Tor IPs like any IPs: if they detect abuse from the IP, they start giving the CAPTCHA.
Finally, Cloudflare has stated publicly[1] that they have a desire to setup .onion sites for their customers automatically. But they cannot do so until the Tor project is able to upgrade the hashing algorithm used for .onion addresses. If the two organizations could work together, this could be game-changing for online anonymity. Imagine millions of web sites automatically supporting Tor!
I can't understand why the HN crowd is so anti-Cloudflare. This Tor thing seems to be one of the major misconceptions.
Disclaimer: I'm not affiliated with with either Tor or Cloudflare in any way.
[0] https://support.cloudflare.com/hc/en-us/articles/203306930-D...