Swift has this weird sort of ecosystem where Apple builds much of the platform in a very secret (most of the roadmap isn't shared), closed-source variant for its own OS. Then it has this open source version, with a very public compiler (roadmap IS shared) that allows cross platform toolchains like this one to exist. I call it out as weird because take SwiftUI for example, the main excuse Apple engineers gave for why…
So, just like Android?
Nominally open, but closed source and proprietary APIs needed for modern apps are installed with the Play Store ?