It is impossible to tell which would have the largest market, all of them have millions of users each day. However, there is a growing market for mobile games: in 2021 alone, they generated $89.6 billion in revenue on Android and iOS combined. Mobile games also do not require the large scale infrastructure and constant maintaining which is essential to some practical and productivity apps. Overall, I would say that mobile games would be the best option for maximising revenue.
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