These are pitiful amounts of changes in comparison. Sonys closed sourced PlayStation changes alone would dwarf these numbers.
You can know how much corporations put into MIT but never how much they extracted.
You can know how much corporations put into MIT but never how much they extracted.
That being said, I think it is important to consider: in a hypothetical world where the BSDs and other copyfree operating systems didn't exist we *still* wouldn't get those patches from Sony. The alternative is not "we have to use Linux now and make our work public", it is "we have to use one of the many commercially available operating systems". Just look at all the devices that ship with QNX.