It is not the Wikipedia approach. Github, not the project, is more analagous to Wikipedia. A project is self contained with references to other projects, as is a page. A repository or a wiki is a collection of these. Wikipedia doesn't really accept anything. Additionally, it has a culture, guidelines and de facto moderators. A political structure has arisen within Wikipedia, but a cursory look misses that. In those ways, it is similar to open source development and the Linux kernel.

Edit: missed a comma