I don't think egress really matters for this use case. How many API calls or HTML pages do you need to transfer 1GB?

You usually use them for compute and low-bandwidth related activities (like an API).

They're close to as cheap as they come for CDN bandwidth list prices without minimums, especially for CDNs with their level of global coverage. Competitors in this space in particular are often much more expensive, like Deno Deploy's $0.50/GB.

Cloudflare is effectively impossible to compare because it's all "free until you get an email from sales".