> The market for people who want to install Linux on a Mac laptop is very tiny.

I suspect there would be an element of induced demand here. IMO the MacBook range are the only laptops on the market worth buying - but not having support for gaming (or at least, hilariously bad support for a limited range of games) is compelling enough reason to install Linux for a large portion of users (filling the void left behind by the widely adopted Bootcamp).

> but the information needed to support an entire platform like this is not as simple as sharing a PDF.

Yeah, GPU ISA, controllers, power management, NPU, and who knows what else. I still believe that companies should be compelled by regulators to offer documentation and support necessary to write drivers as I believe it is part of the "right to repair" (M1 will lose support in 2 years, it's still a great platform).

> They chose to leave it open.

I _really_ wonder on this point. It's so uncharacteristic of Apple. Were they concerned about potential anti-competitive lawsuits and maliciously did the bare minimum to avoid them? "It's technically open hardware, but good luck figuring out how it works"