Re: The only sane thing to do
"it's a volunteer OSS project"
It seems we have to keep repeating this: there are published statistics on who contributes most to Linux. The main contributors are inevitably corporate. It's in Intel's interest, for instance, that their products are supported so they're always there are thereabouts at the top of the list. From memory Google and Red Hat are also leading contributors.
It's a lot cheaper for someone who needs an OS kernel that can be almost met by Linux to take it and tweak it than to develop from scratch and it's also cheaper to contribute their changes back than to have to keep applying them to every new version of the kernel.
It's called collaborative development.