I just couldn’t let this pass. According to All Things D:
So the company is doing something about it. It plans to drop app-sideloading support from the PlayBook in a forthcoming update. “We’re removing sideloading for consumers,” said Alec Saunders, RIM’s VP of Developer Relations, adding that the company is very sympathetic to developers’ concerns about app piracy.
“Piracy is a huge problem for Android devs, and we don’t want to duplicate the chaotic cesspool of Android Market [now Google Play],” he said.