Now I'm wondering what the bar is since even people with millions of users aren't making the cut. I'm orders of magnitude smaller but I signed up too since I had nothing to lose. Didn't get a response, of course.

Is it possible this is vapour marketing and no projects are actually being selected? Perhaps someone from a project who has heard back can respond here?

Anthropic released Fable with builtin prompt injection for sabotage purposes. I suppose anything is possible.