What i can do with AppFlow?

IT is not clear to me what i can do with AppFlow and what do i need to purchase to be able to automatically publish my app to the stores.

  1. With the basic/free account it seems basically useless, is it correct?

  2. Do i need to purchase the 29$/month additional pack to be enable the “cloud build” feature?

  3. Do i need to purchase the “growth” pack (200$/month) to be able to publish the app to the store, or not?