This happens when you are Open-Closed.
This Is EXACTLY The Kind Of Thing Google Is Trying To Prevent With Its Android Crackdown
Sony just launched five PlayStation games for Android, but of course you need a Sony Xperia Play phone to play them.
From Sony's point of view, this makes perfect sense. The company needs to set the Xperia Play apart from all the other Android gadgets out there, and PlayStation games are Sony's intellectual property.