Sure, it doesn't happen overnight. My point was to point out to parent that Apple is not explicitly trying to block other OS's from booting, and alternatives will become available as the systems mature.
You said “already” for Linux and “soon” for Windows. Neither (well one definitely the other speculatively) of which are true.
You're right, I hadn't checked the site recently and I thought the project were further along - I should've said "booting already" to be conservative.
It is implicitly so. As far as I know you need to reverse engineer the whole process and disguise the kernel you want to run as a macOS Mach kernel. They keep a finger on the trigger by having an encrypted Secure Boot system, too. Not to mention how much the system is locked in (soldered SSD necessary for booting, Internet connection mandatory for starting the system the first time, etc..)
One or two steps short of the hermetic lockdown of iOS devices.
And it's doubtful Microsoft would ever go through the same effort to port Windows on ARM to the M1, instead probably relying on Apple's virtualization framework to allow it to run.