Yeah could be just different demographics (and as usual, with any data set you have to keep in mind that it's not "perfect").
E.g. Unity apps are mostly games, so this probably represents "android users who play games". Whereas google's is "anyone who went to the store" (which I guess is a much wider population - as soon as anyone wants a Facebook app they have to go to the store, right?).
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Yeah could be just different demographics (and as usual, with any data set you have to keep in mind that it's not "perfect").
E.g. Unity apps are mostly games, so this probably represents "android users who play games". Whereas google's is "anyone who went to the store" (which I guess is a much wider population - as soon as anyone wants a Facebook app they have to go to the store, right?).