RMS advocates such a law. In the meantime, to increase the amount of software that does come with source, he decided to replace critical proprietary software w

RMS advocates such a law. In the meantime, to increase the amount of software that does come with source, he decided to replace critical proprietary software with free software that requires any derivative to come with source. Decades later, the law is still nonexistant, so the workaround has turned out to be quite important. Copyright is just the tool that happened to be useful for implementing the workaround. Freeware is irrelevant to the discussion, it is just proprietary software that happens to have a zero price.