You are forced to give away all your hard work and expose trade secrets, if you use anything GPL. Because Stallman is a statist commie-nazi.
True. Once is free, you can’t sell it. Once is free even if was created by yourself even if you donate it for free it doesn’t have any value for the receiver of donation because anyway he/she can get it for free from the people who ‘modify’ your work, from plagiators.