The page says that the Bandwidth Alliance means that partners will charge less or no egress to cloudflare.
I'm not seeing it saying anything about different rules applying regarding CloudFlare ToS such as "2.8 Limitation on Serving Non-HTML Content" to Bandwidth Alliance sources.
But has that been said somewhere I'm not seeing? Would love to see it!
https://www.cloudflare.com/en-gb/bandwidth-alliance/
With this said, I believe there are restrictions for certain types of content (eg: video). Cloudflare needs to be more clear here to avoid confusion.