It's definitely intentional but the reason isn't exactly clear IMO. It could be resource constraints, in the sense that they don't want to dedicate resources t

It's definitely intentional but the reason isn't exactly clear IMO. It could be resource constraints, in the sense that they don't want to dedicate resources to developing apps for other platforms. Another possibility is control over the environment that users consume their apps. Or maybe Apple sees exclusivity as a selling point of their devices, and an entry point into their ecosystem. Steve Jobs was against iTunes for Windows initially, and it took a lot of convincing from the board of directors to allow it.