Earlier quoted context omitted.
Apple could change the platform/firmware to break Asahi if they wanted to. They could lock down the hardware to make it nearly impossible to install another OS like they do with iphone.
I mean so could any other hardware vendor? No Mac in history has been locked down in the way you describe, and there's really no indication that Apple would start now. If they were ever going to, the ARM transition would've been the perfect time to do it, yet they invested engineering resources into adding support for booting non-Apple kernels into their bootloader. They could of course release a new line of laptops…
For example, intel and AMD contribute a lot of code and engineering hours to open source projects because they WANT people to be able to run that software on their hardware.