This rewrite of GNU coreutils to rust comes to mind https://github.com/uutils/coreutils

"Reasonable people would say that replicating and disseminating code with the express purpose of avoiding copyright is a violation of copyright and why it exists in the first place."

But then how can the FSF reimplement AT&T utilities? The FSF didn't invent grep. They wrote a new version of it from scratch under a different license.