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Apple is opinionated about which languages should be used on their platforms, and they enforce it with these kinds of decisions.

For example, there was a time where Steve Jobs threatened to forbid iPhone apps not written in Obj-C, which would have destroyed the cross-platform ecosystem, at Apple's expense. Luckily, he was talked down from being that extreme.

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Is there any way to enforce that in a way that can't be worked around with a shim? Demanding source code? Looking for signs of other languages in the binary and not allowing them in the appstore if detected?

I suppose the difficulty of proving that, short of demanding source code, helped prevent it from happening.

> Is there any way to enforce that in a way that can't be worked around with a shim?

You can’t definitively prove something was written in Objective-C or Swift, but you can often definitively prove something was not written in either pretty easily just by looking at the assembly.

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