If FB Purity is there for the good of humanity, great; open it up and let the community keep going. But why should I care if it's a primarily financial venture, and someone built their house on quicksand? Building a business on FB by removing new FB features is not bright.
But hes not building a business on FB, hes building a business on browsers to change the way they display FB. This reach alone makes me feel like you're being a bit unreasonable, and the open source demands kind of confirm it.