[kelnos]

I'm not sure this is because no one wants to contribute. I think it's more because Moolenar prefers to do the work himself, and doesn't like to accept much in the way of contributions from others. He's certainly allowed to run his project that way, but I can see why it might turn some people off.

[LeonidasXIV]

Which is yet again contrasted with how NeoVim runs things and the 824 contributors to the repository at time of writing. I believe that justinmk, one of the principal drivers of the project specifically stated that he doesn't want to be something like a BDFL and I assume that's also pretty much a reaction to Vim.