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Another aspect to this is that Android is Linux, but it is not GNU / Linux. This is true both in the literal sense of not using GNU coreutils or glibc, and also in the broader sense.
What I mean by the “broader” sense:
To the application programmer Android / Linux looks like a completely different ball game.
You’ll see that’s not the question that was asked. And it’s okay not to give Stallman any more validation for his fame-grab.