Is Open Source a Cancer?

Many companies, like twitter, google or facebot co ople even forget win facebook. The truth of many companis with us is that theres as huge up front castsan sort of where you cind of sell the farm. You cannot sell your rights your farm at the beginning. And i think it's good to go back and ask why does this happen? If mark zakeberg wanted to be inspired by this story, what could he ptach to the theory?