This aims to explicitly solve the problem of "okay, but most maintainers just skim the code at best and spend time on packaging", plus it aims to parallelize it.

And while some packages have been distroized (eg. a lot of old perl packages, a lot of python packages, some java/node packages) I have no idea if any rust package is distro packaged separately. (Since rust is static linked there's no real reason to package source code. Maybe as source package. But crates.io is already immutable.)