Maybe, but I'm just talking about the potential here. Most type of volunteer works require more people, with some level of organizations before it becomes effe

Maybe, but I'm just talking about the potential here. Most type of volunteer works require more people, with some level of organizations before it becomes effective. While open-source software projects are often started by one very good SWE, as a hobby, in his own time: a very low barrier of entry. Plus, a project can live with a solo maintainer for a very long time. Though, I digress that can be detrimental in the long run, like the recent xz-utils fiasco.