I think a lot of the cross-platform interest from other companies diminished after features like result builders were quietly dropped in to support SwiftUI, with the usual community review process happening after it was already revealed at WWDC and shipping in Xcode (!). It's clear that Apple runs the show, and like Objective-C, it seems destined to be primarily an Apple language for Apple platforms and tools.
This is a troll comment considering the post is all about Swift’s portability on other platforms.
It's been over a decade since Swift came out, and cross-platform Swift remains extremely niche. I think that ship has sailed and that Swift is in the same situation Objective-C was, perceived as being an Apple language for Apple platforms, controlled by Apple.
It isn't, I didn't deny Swift's usability in other platforms, but you'll see it barely mentioned anywhere else, and Swift Circles are also mainly centered around Apple