I think it's interesting that Rust is so rarely used among this list of security related projects.
I don't find it the least bit interesting. Rust is good for reducing memory related bugs, it's not like many of these projects require that and it's not like you can't have the same level of safety using other languages if you have quality code. I'm not hating on rust, it's a plenty fine language with great safety and features. It's just irrelevant to most of the projects listed.