I’d remove “go” from the above, i.e. I think same applies to other stacks.
Even using GitHub domain links in code comments gets problematic long term. Ie when a migration happens and those links start pointing nowhere.
One day, we’re all going back to vendoring dependencies.
Here's mine: https://github.com/foundata/hugo-theme-govanity (e.g. used at https://golang.foundata.com/ )
And yes I'm aware of the irony of hosting this on GitHub... still figuring out a good workflow for maintaining our OSS on Codeberg and GitHub in parallel fed from the internal forge. The dependency on our own domain is real but we favor it.