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It is. There's react-native-windows by Microsoft.

MacOS via react-native thanks to Catalyst.

A mature GTK RN fork would be nice, currently Electron is the only practical solution for Linux.

I'm working on a project that glues these technologies together: https://ult.dev/

I know these projects exist, but it doesn't look like they're getting as much traction as the mobile version, unfortunately.

I think the core React-Native team offering an "official" solution would go a long way here, and it's kind of sad that they didn't.

Microsoft is rewriting react-native-windows from C# to C++.

It's very active and they keep up-to-date with the upstream RN fork.

After the rewrite it will be merged into react-native. There's work already done there.

Catalyst opens up the doors for react-native to work on MacOS without many changes.

That's great to hear; I hope they get traction (and Lunix support) and become a viable alternative to Electron on the desktop.

Something like that is being attempted with https://github.com/hecrj/iced

You can already use React Native to deploy to macOS, via Catalyst. I'm doing it now.