[brudgers]

Just to be circumspect, Apple's main business isn't building compilers. Their business unit which does so appears to derive some of its mandate from management's aversion to copyleft licensing. The business case for the Swift compiler is not to be the best alternative in a diverse market place but to provide tooling better than objective-C for bespoke iOS and OSX development. It falls somewhere between an inhouse application and a product for the open market.

I'm not saying there is anything wrong with that. I am only extending the line of reasoning in the comment up an abstraction layer.