$100 Million investment isn't a stretch for something from a large company.
Also, according to libreboot FAQ, even Google was unable to get source for Intel firmware blobs.
from their site:
"For years, coreboot has been struggling against Intel. Intel has been shown to be extremely uncooperative in general. Many coreboot developers, and companies, have tried to get Intel to cooperate; namely, releasing source code for the firmware components. Even Google, which sells millions of chromebooks (coreboot preinstalled) have been unable to persuade them.
...
Basically, all Intel hardware from year 2010 and beyond will never be supported by libreboot...."