I was surprised to hear this so I went searching. Yep. Wow. [1]

I use GitHub all the time but I never expected it to be mandatory if you wanted to publish a package for a popular open source language.

But as the top says, “If you are interested in helping with this work, please feel free to get started!” (Though only if you’re a contributor or open a duplicate issue)

[1] https://github.com/rust-lang/crates.io/issues/326