I can buy any Google Chromebook today and build coreboot for it. It comes under the GNU GPL.
That coreboot port isn't the result of reverse engineering. It's Google's own code. The **vendor BIOS** is coreboot.
I can add that chromebook to libreboot, with GNU GRUB, SeaBIOS, Tianocore, Linuxboot, whatever the hell I decide, and sell it on minifree.org
I can make it better, and sell my improvements.
I can't do that if it uses a FUTO license, which thankfully it does not!