There is no Rust tooling that tells you if your unsafe code is shit or not. If there was you wouldn't need the unsafe stuff at all.

The Actix web stuff was the maintainer using unsafe code to increase performance (iirc, it was a long time ago) in what was the most popular rust web frameworks at the time. It has since declined and been supplanted by other projects but the push was mainly a web framework shouldn't need so much unsafe. They eventually ceded the project to another maintainer and went off to work on something else.