While I understand what you’re saying, the developers of Asahi have said before that Apple appears to be going out of their way to leave things open for them.
Apple’s boot security is enough they could easily prevent anyone from ever running a non-Apple blessed OS. But Apple made it fully supported to boot directly into a non-Apple OS as your primary OS.
They’re not helping by giving code or documentation, but they’re not putting up roadblocks. Apple seems to be happy with a stance of benevolent indifference.
It’s not official support. But a number of PC vendors don’t give official support either.