It used to be that you'd bag the spent capsules up, and they would collect, or you could return them to the store.
My local store has now closed, and the collection system is really difficult to master - I haven't managed it yet.
So, they can paint themselves as environmentally-friendly, but do bugger all.
Plus, they make it difficult/impossible to complain, apart from talking to a robot.
I know this is a 1st world problem, but I felt the need to vent.