I installed a few rust binaries the other day, like wasm-tools and the typst compiler. I installed them from cargo. Each program probably had 30-50 dependencies

I installed a few rust binaries the other day, like wasm-tools and the typst compiler. I installed them from cargo. Each program probably had 30-50 dependencies which were downloaded and compiled from cargo. Do fedora and apt try to mirror all of the packages from crates.io? Are they kept up to date? Is this a manual process, where a human picks and chooses some packages and hopes nothing is missing, or is it a live mirror? If it’s done by hand, what are the chances all the dependencies for some given project will even be available?