It's not true in the same way about apple's ARM devices either. Microsoft's actions control the hardware's boot code, which (I am assuming) cannot be flashed easily as it's not generic between devices. Apple's control over iPhones is bypass-able via jailbreaking (I've seen iPhones that dual boot android, which wouldn't be possible with a similar restriction.)
Apple make this stuff hard and fiddly (and, on iOS devices, mildly dangerous). Microsoft are making it impossible, if I've understood correctly.
>Apple's control over iPhones is bypass-able via jailbreaking (I've seen iPhones that dual boot android, which wouldn't be possible with a similar restriction.)
Is there really a way to install Android on iPhone 4/4S or the iPad?
Then why aren't a whole bunch of people doing it? Because no one really cares about dual booting a personal device and the associated headaches with keeping things in sync?
I suspect that differences in the way operating systems format and read persistent storage create some interesting technical challenges for a dual boot device.
Apple make this stuff hard and fiddly (and, on iOS devices, mildly dangerous). Microsoft are making it impossible, if I've understood correctly.