I've seen this for a while now. We are (miss)using the custom close reason:
Has anyone spoted the problem here? As you can see, both say the same with different wording. Why should we close it with a custom reason instead of the already loaded ones?
Same happens with Android questions (that has nothing to do with Ubuntu). The first close reason is "This is not about Ubuntu.". This should cover all cases where the question is not about Ubuntu, I don't consider that we should write a close reason just for Android, if we get several of these questions we could add the correct place were to ask to the first close reason. Of course, I'm not saying that you shouldn't write your own custom reason, but only write it if the other close reasons doesn't fit. If there is already a close reason that applies, why write another?