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Is it yet possible to build an iPhone app using something like React Native on Linux? This is the only reason I'm still on a mac.

Kind of but not really: http://www.proreactnative.com/How-to-Develop-iOS-Apps-on-Lin...) I see no reason why Apple would make it easy to develop iPhone apps on anything but MacOS.

I think something like this exists, but you still need a Mac because you still need Xcode to sign and publish afaik.