Software, in general, has a lot more people using it than writing it. Successful software, anyway. And super permissive licenses like MIT hurt developers too,

Software, in general, has a lot more people using it than writing it. Successful software, anyway. And super permissive licenses like MIT hurt developers too, because it means I oftentimes can't see the source code that someone else has modified, even though it would help me a lot to be able to do so. With GPL-licensed software, I am always guaranteed this freedom.