In addition to the other reasons listed below, Apple employee's provided the initial ARM porting patches in the first place.

It sounds like Microsoft was involved in this project (though the text seems to imply Qualcomm might have been the primary contributor), it remains that they didn't do it however many years ago when Windows on ARM was first released.

Also Apple had done it before - twice, really. 68k -> PPC ('member FAT binaries?) -> Intel -> ARM