[krunkcoin]

Incorrect. Apple's original presentations on Arm Macs suggested that booting other operating systems would be supported, and recently this has been confirmed by two of the engineers who worked on it.

https://twitter.com/NikolajSchlej/status/1339790008589242369 https://twitter.com/XenoKovah/status/1339914714055368704

Although you cannot turn off secure boot on Arm Macs, Apple has deliberately provided a path by which you can prove that you really want to chainload to a user provided bootloader not signed by Apple. From there, obviously, it will be possible to load the kernel of another operating system, such as Linux.