yeah, but in those cases you have cited, the interested party get the source and implements it on its own codebase himself eg. microsoft using bsd network laye

yeah, but in those cases you have cited, the interested party get the source and implements it on its own codebase himself eg. microsoft using bsd network layer on windows and freebsd porting linux drm to its own kernel.. this is different.. its aggregated as a product that target several os´s with different implementations for each kernel, but shareing only one core codebase.. this tends to be much more stable and cheap to everybody.. less bug prone, etc.. didnt heard of anything like it..