I wonder if it would be legal for a veteran of Apple, who has worked on porting MacOS to M1, to take that knowledge of the hardware and assist with BSD or Linux

I wonder if it would be legal for a veteran of Apple, who has worked on porting MacOS to M1, to take that knowledge of the hardware and assist with BSD or Linux porting? On the one hand its just porting to a piece of hardware, but on the other hand she may be using some proprietary knowledge of a closed interface. Anyone have experience with doing this for Apple hardware? Does the company come after you if you reveal some of this knowledge to the wider public? Not asking for myself, BTW, as I have had no affiliation with Apple.