It's just Fastly's laundry. Fastly does not publish their pricing [1]. And, you need to contact a rep to sign up for commercial use [2], which implies everyone gets a different deal. Yet they claim contacting Cloudflare to do benchmarking means it's
impossible for them to do a comparison,
> [FASTLY BLOG] it's impossible for us to define our own terms for a comparison because Cloudflare’s terms of use prohibit benchmarking of their services
>> [CLOUDFLARE TERMS] (f) perform or publish any benchmark tests or analyses relating to the Services without Cloudflare’s written consent;
That is not so different from Fastly's own sign-up process.
[1] https://www.fastly.com/pricing/
[2] https://news.ycombinator.com/item?id=29468455