It's not a Nim specific problem. It's GitHub. It's not a coders community, it's (has become) a dumping ground for code. The beautiful idea that a passer by contributes is a folly. Also the idea that you can there create a community around your work does not work. Pure users have nothing to contribute but bugs and complaints. There's 'no' user coder interaction.
GitHub is a "silo" and rather anonymous. Would you host incomplete, half baked code on your own site, next to your resumé? Would you put code up there you can't, won't, will not maintain?