As a dev who has worked on mobile games:
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The stores have a serious problem with discovery which makes it unreasonably difficult to find the good original games in the sea of shovelware, but the good stuff IS out there.
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People say they hate free-to-play and that they'd happily pay once for access like a normal game, but the stats say otherwise. Almost no one pays for premium mobile games, and that's why no one bothers making them.
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People who use 'mobile game' as an insult are usually wilfully ignorant about the platform and just have an axe to grind.