You use their code for free and call them "idiotic or malevolent" when they make it harder for you to use their code for free. MongoDB is little more than mmap

You use their code for free and call them "idiotic or malevolent" when they make it harder for you to use their code for free. MongoDB is little more than mmap() attached to a socket. They would be nowhere without piggybacking on a million lines of other people’s free code.