I sincerely wish this kind of project goes far. At best we'll finally escape apple's grip on UI and swift and their awful documentation and no OS support beyond apple, at worst it'll put some pressure for apple to open source the tech and have the community port it to android.
What do you mean by Apple's grip on Swift?
look at the discussion on swift forum when SwiftUI was announced. They added a huge batch of new features to the language with a huge proposal that got released with xcode eventhough it has never been discussed beforehand publicly (for obvious reasons).
Apple is clearly the main force behind Swift at the moment, which has some good sides (at least the language is evolving), but is pushing the tech toward a certain direction at the detriment of others (IMHO). Apple is mostly building frontend tech, and swift initial goal was to also be a great force for server-side tech (which means great cross-platform experience).
As an example, i don't think apple is ever going to release a server side framework, or a cross-platform GUI framework able to create android app. The only swift/android project i know on github (https://github.com/readdle/swift-android-toolchain) is using a swift fork to disable objective-c features that don't work well on other platform. That's telling.
Maybe not, but there is this: https://github.com/apple/swift-nio