It is intended to be migrated. Nothing has been done in Swift yet.
Ladybird is all C++ though a somewhat unique dialect of it.
Servo is a browser engine written in Rust.
The point is not the specific language, but the approach. The split from Serenity OS (and its "C++ only, no external dependencies" approach) made Ladybird a lot more attractive for both funding and potential contributors.
I am well aware, the point is that ladybird is a new project following some standards and they are free to use a memory safe language now.
Ladybird isn't using rust.
The point is not the specific language, but the approach.