If no one gets paid, no one can pay for anything. What are they supposed to live off? Thin air, welfare/benefits or inherited money. At least the people who write Britannica get to make a living.
I edited Wikipedia for many years and have seen how it has (d)evolved into an oligarchy. I have absolutely nothing to show for it, and now I see companies using it to build products which they do make money off. They are making money off my work (and others). I am glad that I did get to make sure Wikipedia covered certain subjects, but it was not a rewarding experience otherwise.
I've sold fanzines and published stuff in hard copy, and they made a little money. Not enough to live off but far more rewarding than my Wikipedia interactions.