Isn't this pretty much what the GPL was designed to solve? Stallman had to make sure the derivatives were open-source to make GNU going. If he used the MIT lice

Isn't this pretty much what the GPL was designed to solve? Stallman had to make sure the derivatives were open-source to make GNU going. If he used the MIT license, people wouldn't have felt the need to try and build something that could compete. But because they knew their rights were protected they had a chance against the reigning.