From what I've seen it _seems_ the language's creator is not interested in corporate sponsorship. It's been some time since I was interested in Nim, so I don't have any direct references to this claim. A web search would probably provide several examples. It was one of the main reasons why I decided to focus on other languages.

this is a who comes first, chicken or egg

Nim is one of those languages that tries to be everything for everyone, trying to fill the range from python to C++

If Nim had any strategic edge anywhere, someone smart would have picked it up to build something very successful and it would have had more sponsors

AIUI, Reddit uses it for some internal tools. They would be a good backer.