Yes, let's clarify: crates.io expects a Rust crate, which itself can contain whatever junk the uploader wants. But crates.io isn't taking your source, building

Yes, let's clarify: crates.io expects a Rust crate, which itself can contain whatever junk the uploader wants. But crates.io isn't taking your source, building it, and then distributing those executables; at the end of the day it's distributing the source code of a Rust crate as given by whoever published it.