Pricing clarification of inter service communications

### What problem are you trying to solve?

Many cloud services do not charge for requests and responses between services within their infrastructure (e.g. I believe this is how AWS works).

Knowing this can impact decisions around microservices vs monoliths, etc.

### Describe the solution you'd like

I'd like to be able to reference Deno Deploy docs that clarify whether this is the case or not for Deno Deploy.

### Describe alternatives you've considered

Emailing deploy@deno.com for clarification but rather than having the answer floating around in some emails I'd rather have online docs to reference and share with coworkers, etc.

### Documentation, Adoption, Migration Strategy

_No response_