Open-sourcing Swift doesn't really have anything to do with being able to run iOS apps outside of iOS. Objective-C has been open-source for a very long time, an

Open-sourcing Swift doesn't really have anything to do with being able to run iOS apps outside of iOS. Objective-C has been open-source for a very long time, and this would at most only bring Swift to the level of openness of obj-c. There's countless libraries unrelated to Swift that you'd have to also open-source to be able to run iOS apps as-in on an entirely open source stack.