I hate subscription services and smart home solutions, but you've hit on an actual solution to an actual problem. I have a subscription with Peace Coffee right now that I have to manually manage. I only subscribed because it saves a good bit of cash. I'm sitting on an extra 5lbs of coffee because I'm not good at that kind of thing. This resolves that.
I'd totally sign up today, but why only a dark roast option? Add light roast and I'm 100% in.