One could argue that Rust isn't well suited for GUI development at all, where class-based OOP really shines.

Then there is the issue that the Rust community likes to rewrite classic C programs because of "memory safety" and "modern tooling," but really just focuses on the easy 80% of the work. It feels like these rewrites are more done to gain popularity on GitHub than anything, as they most often remain incomplete and never replace the original implementation.

Finally there is the GPL to MIT licensing issue, on which much has been said already.