It's community-owned, there's no company.
> The website codebase has no license and the Github application code is not open-source (or I overlooked).
The website codebase is licensed under BSD, and the source is linked at the footer of every page:
https://gitlab.com/codeshelter/codeshelter-web
The website is also in the Code Shelter itself, so any maintainer can commit.
> There's no privacy policy, ToS, and CoC.
I don't know what the first two would be good for, as it doesn't really have personal data to be private about? I guess there's the list of maintainers per project, but it's all public.
> What is the maintainer vetting process?
This is detailed here (where the "become a maintainer" button on the front page goes):
https://www.codeshelter.co/membership/
> How is matchmaking taking place?
Maintainers select a project they like, they click a button, and they get commit rights to it.
> What can I expect after giving away control?
This is detailed here (where the "add a project to the Shelter" button on the front page goes):
https://www.codeshelter.co/projects/add/
I appreciate the feedback, but these are all easily-accessible pages, linked from the front page. I'm not sure how to make them more easily accessible than that, sadly.