[0]: https://support.microsoft.com/en-us/windows/options-for-usin...
[0]: https://support.microsoft.com/en-us/windows/options-for-usin...
https://www.arm.com/architecture/system-architectures/system...
Many arm64 devices run windows for arm today, including non Qualcomm devices like ampere devkit, honeycomb lx2 and even raspberry pi. They all have systemready firmware.
Apple's firmware is not standardized, compatible or certified as systemready, which is why it can't boot windows for arm. Apple's choice of firmware is up to Apple right?
That website claims that license keys are platform agnostic.
I don't have a horse in any race or even know any of the facts. But it is entirely possible for the keys to be hardware agnostic and for MS to have a deal with Qualcomm restricting getting Windows to run natively on Apple (or other random) hardware.
Edit: such a deal would not stop you or I from developing drivers, but it could stop Microsoft from lifting a finger to support that.