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Version numbers. You can’t modify an already-published version of a Rust crate on crates.io.

Who in practice pins their dependencies (transitive included) on audited versions?

Small companies with little development experience like Google and Mozilla.

(You can check the files I linked and see audits between deltas for minor version updates)

I guess my point was: "because [some teams at] Google/Mozilla do it right does not mean that everybody does it right".