In my experience, you have to be way above 1 TB per day to get banned - I know because I pushed around 5000 simultaneous HD streams on my account back when I ran a pirate streaming service (Google my name if interested, it's on the Verge), and it lasted for a few days before I shut it down due to MPAA, but didn't get banned by CloudFlare. I still have the account that I did that on, it's from 2011. and still used for a few of my sites.