bpye parent
Is that really realistic? Apple very specifically allowed booting unsigned, and even non macOS, operating systems on their ARM devices. Sure - they don’t document the hardware, but making it possible was intentional.
Yes, making it possible was intentional. But it just goes to show easy it would be for them to remove that option. While they are currently specifically choosing not do that for their own hardware, they could change their mind tomorrow.
For precedent, Microsoft locked down their own ARM hardware to Windows.