The analogy doesn’t really make sense because W3W isn’t on “any system that supports updates” or “anything that generates or consumes mapping data”. The whole point of most of this discussion is that it’s a proprietary database that they only share via online services or licenses with applications. As far as I’m aware, none of these are embedded systems that are impossible to update, they’re either owned and operated servers, or iOS/Android apps installed from a store with built-in update support.