I see FOSS as more of a marketing tool for profit-motivated entities / founders. It's the modern, marketing equivalent of a limited, free trial for software. But, ultimately, if your company is owned by shareholders, their motives are your motivations. When the money matters more, this is what you get.

FOSS is all about idealism. It's hard to retain your idealism when someone is waiving $1+ billion dollars in your face with one hand and holding a loaded gun to your head with the other.