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Also, Safari on Windows had low usage, and was probably a pain to maintain. Swift cross platform is more about abstracting out Apple specific things (like the standard library and UI toolkit). Apple has already been investing multi-year efforts into Swift on the server for longer than Safari on Windows existed. The last couple versions of Swift (~3-4years of development) have been almost entirely focused on safe concurrency, which is intended for server-side development.
Rust is a lot more niche and intimidating of a language compared to Swift. Swift is familiar to C++ devs, while modernizing the language and toolchain, and providing safety guarantees.