Netflix chose FreeBSD to run their CDN, perhaps partially due to kernel licensing, but that's obviously a space where performance and stability matters.
Netflix contributes. Real Code. Rock stable. High quality. For so many years. So its not only the Free-Beer-License for them. I have never seen a single commit comming back from others, who build the most (financial) successfull trillion dollar bussines on top of FreeBSD, but comming back again and again, to (hard-)fork.