I do think that there's some work that can be done to improve reporting on our side: cargo should be able to report not just "how many crates are in the dep tree" but rather "how many owners am I depending on" and "how many repositories am I depending on". For example, I just noticed that there's no way to see in crates.io other crates that live in the same repository, like it does per owner, even though it has that information available.
Cargo currently has `cargo tree`, which prints out a dependency tree. There's an extension to cargo which also shows how many people have the ability to push to your dependencies, titled `cargo-supply-chain`.
There is really just a handful of crates that nearly often get pulled in and probably like 5 authors across them.
Supply chain harderning is pretty easy in rust: caro-deny, cargo-suply-chain, cargo-crev, cargo-vet, cargo-{s}bom and probably a few more I can't remember.