Another answer could be that Sony and Nintendo have huge lobbying power in Japan, and they don't want to undermine some of their most important industries. You

Another answer could be that Sony and Nintendo have huge lobbying power in Japan, and they don't want to undermine some of their most important industries. You could argue that the business model of consoles also doesn't support this, but Apple arguably also makes a fortune on their 30% lock-in charge. They are probably double-dipping though, since the margins on iPhones must not be all too bad.