The difference is that in another language the build step is delegated to someone else who has packaged the code, and every version has presumably gone through some kind of audit. With Rust I have no idea what new transitive dependencies could be included any time I update one of my dependencies, and what code could be triggered just by building my program without even running it.

Again, we're not talking about the dependencies that I choose, but the whole transitive closure of dependencies, including the most low-level. Did you examine serde the first time you used a dependency that used it? serde did have in the past a slightly sketchy case of using a pre-built binary. Or the whole dependency tree of Bevy?

I mean, Rust has many advantages but the cargo supply chain story is an absolute disaster---not that it's alone, pypi or nodejs or Ruby gems are the same.