Use of the Services for serving video or a disproportionate percentage of pictures, audio files, or other non-HTML content is prohibited, unless purchased separately as part of a Paid Service or expressly allowed under our Supplemental Terms for a specific Service. 
 2.8 Limitation on Serving Non-HTML Content https://www.cloudflare.com/terms/
See: https://www.cloudflare.com/supplemental-terms/ § Cloudflare Pages and Cloudflare Workers®
The said limitation should apply however to their tranditional service with orange on whether it is B2 or not. I am not sure if being a Bandwidth Alliance partner makes a difference.