What is the minimal data-sharing setup for the Glow IHD/CAD?

I appreciate that Hildebrand has a non-hardware/non-CAD service that acts as a "DCC Other User" service, where their cloud service acquires energy usage from the DCC to expose on their site and through their app. I also understand that possibly because they are a DCC Other User registered entity they can request pairing with the SMETS2 Zigbee HAN for their IHD product. But can these two services be separately used?

I do want to buy a local device that collects the data from my meter over the HAN and sends the data to a local MQTT server. But I don't want that device to send any data to any service outside of my local network (Which I'm happy to block myself if needed), nor do I want to authorise any entity other than my electricity provider to view my energy usage (Mostly because its a proxy for occupancy data for my home)

Does anyone know if this is possible? If I bought the Glow IHD could I set it up/pair it with my HAN without also authorising Hildebrand to get a copy of energy usage data from the DCC. Does the Glow IHD stop functioning if it can't send data to Hildebrand's cloud infra?