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SwiftUI is a platform specific API for developers who are writing native apps for that platform.
You can think of Swift as being similar in concept to Rust and SwiftUI as being similar in concept to Win32.
I don't know why you skipped over that part? It's maybe like when Google rewrote Java. Win32 is a bad comparison because there's no Win32-compatible API for native apps on other platforms (that I know of?) except for emulation, but the Android SwiftUI project is not using emulation, it runs the code natively and the result is native Android UI.
There are third party attempts to create something that lets SwiftUI code run on Android, just as Wine is third party software that allows you to run Win32 apps on Linux.
For example:
> Bringing Swift and SwiftUI to Android
As I said, Wine provides emulation. But the SwiftUI on Android project does not emulate - it runs your SwiftUI code natively (as Swift that is compiled for Android), and maps it to native Android components, fully accessible and meeting platform expectations.
Completely different result and experience.
This also means that you can extend the SwiftUI on Android code with Android-specific code that will not run on iOS, to add other Android-specific UI. This is impossible with Wine + Win32.
And that's my sympathetic opinion, as a Linux developer who loves their native UI trinkets and pseudopolish. Windows developers have dozens more options and likely won't find out Swift ever existed until Swift 2 is announced during a keynote presentation. Broader adoption of Swift has simply failed. If the language disappeared tomorrow, I wouldn't know as nothing on my system consumes Swift as a dependency according to nix-tree.
Electron - not available on iOS, so it is out of the question.
I make a living off my iOS/macOS apps so I am interested in ways to diversify without giving up the platform that makes me my money. These cross platform solutions for Swift are interesting for those targeting Apple platforms. I agree they are not compelling if you do not prioritize Apple platforms.
I can't make a living off Linux like I can on Apple. Android is also much less profitable. So Apple continues to make business sense for me, for what I build and who my customers are. And thus Swift.
I think a better defense than the libertarian "don't tell me what to do with my property" would've taken the angle that "university X isn't actually becoming a factory for pumping out techbro libertarian scourges of society".