The app had unique tie ins to the hardware and some real custom programming that made ripping a functional app impossible. However, it has finally been done by Tom Hounsell, who's been very big on the XDA seen and led the charge on making these apps available for all (who have a developer unlocked device).
So what changed? HTC evidently "...did the kind thing and removed all the breaking code from the old version" as Hounsell informs us in a Tweet. So does HTC want us to rip these? We doubt it, instead it was probably done to just make things easier. Regardless, we loaded it up on our LG Quantum and had no issues running it, making it a great addition, much to HTC's probable disapproval.