Is the Cloud service required?

[Parody]

FWIW: my guess for the two most popular usage patterns for Realm Works are:

GM develops and runs completely from one machine.

GM develops primarily on one machine, syncs to second machine, runs from second machine (making limited amounts and types of changes), syncs back to first machine.

It'd be easy for LWD to see (based on syncs from different machine IDs to a cloud account). I'm just going from "how many computers do most folks use" and "how many campaigns do most folks run". :)