Companies don't contribute code to FOSS projects because a copyleft license forced them to. (If all they need is to comply with the GPL, they just throw an undo

Companies don't contribute code to FOSS projects because a copyleft license forced them to. (If all they need is to comply with the GPL, they just throw an undocumented unsupported code dump onto their website!!!) Companies contribute code because the upstream project will maintain the code for them! Sony PS4 is a horrible example to cherry-pick. They probably didn't do any serious modifications to anything, they mostly built their stuff on top. A much better example: Netflix upstreaming their reimplementation of sendfile() to FreeBSD. Because it's been upstreamed, they don't have to maintain it for compatibility with other upstream changes anymore, people who make those changes will fix the sendfile() code.