I wish, as someone who has been job searching, that I could use something like this...Have you reached out directly to employers or did you just post about it to hackernews?
Also note that the costs of flying someone in right now is mitigated by the fact that all on-sites are virtual right now. And unemployed people in 2020/2021 may not have the luxury of being picky about a higher salary. You tried launching this in a weird year.
I certainly can do more "things that don't scale" but so far the response has been limited, so that I'm not even sure if it's a matter of reaching more people or it's just not something employers want.