@maxxcan It is done out of philosophy; specifically, the ideology that says all software should ideally be libre.
I merely go about it at a different angle than that of the FSF or GNU project; I used to be part of the FSF/GNU dogma, but not anymore. I drifted away from their way of thinking.
There is a lot of nuance to the BSD philosophy, that a lot of people in Planet GNU don't grasp. We're just as pro-freedom, in fact arguably more pro-freedom; copyleft is a curtailment of your freedoms.