Why the hell would they do that? Jeez, sometimes I wonder what the hell these companies are thinking...
It's as simple as putting this next to the download link:
WARNING: Only compatible with Bulldozer processors. Other processors, do not flash.
It's the reason behind Biostar waiting for the final stepping before releasing the board, others would of done well to do the same considering the boards ended up being poorly optimized for deneb/thuban anyways.