Granular controls are not available on free Cloudflare, but you won't encounter many captchas on the free tier either. It's a double-edged sword. As a user, I have a dislike for Cloudflare, but as a webmaster, it simplifies my life to a great extent. I used to manage a website that received a huge amount of bot traffic, to the point where 65% of my host's monthly bandwidth was consumed by serving content to bots. However, thanks to Cloudflare, that percentage dropped to less than 5%. The free CDN service they offer is also quite decent.