They do have an option; they can choose to not publish their work. By digitizing your creation, you are creating a version of your work that can be distributed

They do have an option; they can choose to not publish their work. By digitizing your creation, you are creating a version of your work that can be distributed at practically-free prices with little effort. If that undermines or undervalues the art you make enough, you can choose not to share it. Even Open Source advocates don't really have the right to stop companies from using Open code. The license discourages it, but everyone from Tesla to Nintendo has been caught violating it's terms. Publishing stuff on the open web has always had consequences, unfortunately.