They support it about well as they did in Intel, which is to say that they left the door open to it. At the volume that Macs ship at, and the interest they garner, this is mostly enough to get people willing to put in the effort to make it work.

Yeah, I agree they “left the door open”, but the point I was making is that Apple provides zero resources (docs, data sheets, people to help, etc) that I’ve seen to those who are trying to reverse engineer the components in their machines to get them to work with an open source OS. Like an internal engineer tasked with working on an A series processor gets a tens of thousands of page PDF on the processor alone, not including similar PDFs for the GPU, but good luck ever getting that from Apple to port say Linux to it.