Edit:
To specify, new projects like sudo-rs may seem promising, but going by observation and experience with similar projects, there is no guarantee that sudo-rs and similar projects will be successful, good and continued to be maintained. The problems with old projects can end up applying to new projects as well. And projects in Rust are no exception, going by experience with existing, older Rust projects.
Aside, a pet peeve I have is that for instance Ruffle has not turned out as successful as I had hoped for, even after several years and many sponsors. The proprietary Flash runtimes written in C still outperform Ruffle greatly in some cases, causing problems for some users that want to use Ruffle instead of other runtimes.
This seems like a bit of a non-sequitur; the state of non-sudo-rs projects/libraries says nothing about the state of sudo-rs itself.
Not to mention that I'd imagine a similar statement would probably be true for projects and libraries written in any reasonably popular language.
Sudo uses the OpenBSD license, while sudo-rs is dual licensed under MIT and Apache 2.0. Both licenses seem equally permissive to me.
The Rust smokescreen is mostly being used to slowly eradicate the GPL.
Like Lenin said, "Who stands to gain?"