Also for the first few rolls (if you are accessing the freebitco after a long break) Cloudflare captcha will solve automatically and it will gradually increase its difficulty as you use it more often. I don't know this logic for the increasing difficulty in solving captcha when they know that the person other side is human (as he is solving captcha correctly). This behaviour of Cloudflare captcha is not only with freebitco but you will experience it everywhere where Cloudflare captcha is implemented.
It's something similar like Google's ReCaptcha. For most of people it doesn't makesany problems to solve it, but when people were using it a lot on faucets, difficult of captcha become very high and it took a while to solve it.
Since Freebitco.in introduced Cloudlfare, made already quite a lot claims from faucet, but so far didn't had to solve any captcha.