What exactly mean “No Outbound Networking” in free tier on Cloud Functions for Firebase?

Question

In Google Firebase pricing (https://firebase.google.com/pricing/) table states:

The Spark plan only allows outbound network requests to Google-owned

Answer 1

no, they do not talk about JavaScript Functions, they talk about serverless computing functions

https://firebase.google.com/features/functions/

theses functions can make only make http calls to Google Services and e.g. not to Yahoo or Amazon services