Publishing source code doesn't preclude making money off it. There are many natural experiments in this category, where source code of proprietary products was

Publishing source code doesn't preclude making money off it. There are many natural experiments in this category, where source code of proprietary products was leaked with little ill effects. It's happened eg to Windows, many games, VMware... This pretty closely models the scenario of making source code public but not giving anyone license to use it for purposes other than study.