Why does Apple not open up their hardware to other operating systems like Linux. They will already get our money from the hardware purchases, what more do they want. I know Asahi Linux exists but without Apple's (driver) support it will never reach macOS on M1 level performance. (If someone disagrees, please compare Nouveau with proprietary Nvidia drivers.)
There is no incentive to facilitate introducing that hardware into an uncontrolled foreign ecosystem. Apple does not want users looking at their computer while muttering "this sucks" when "this" is an OS+UI famous for incomplete/buggy behavior.
(I've tried going all-in for Linux several times. The amount of "oh, you've got to tweak this..." makes it unusable.)