Earlier quoted context omitted.
Does it actually require any serious development or it is just mostly tweaking and changing things here and there? I am sorry if that sounds ignorant, but I thought these are just low hanging fruits to harvest. Also why Apple wouldn't do that themselves? To me it is an opposite to "nerd marketing", a big middle finger to Linux users - essentially "you are on your own".
A middle finger from Apple would be locking the bootloader–keeping it open, plus providing minimal tooling and telling people to figure it out, is about as close to "we'd love to see what you'll do with it" as Apple could possibly give. (Dealing with the GPU is going to be the majority of the work, I'd think.)
...without the documentation that would help you.
When Broadcom act like this they're considered villains and we're recommended to stay away from their hardware. But when Apple do it, they're being benevolent?
And that's ignoring the fact that I could actually get Broadcom documentation in exchange for dollars and NDA.