Because, unfortunately, not enough people buy premium games on mobile.
The mobile version of King of Dragon Pass sold well enough that David Dunham not only created a sequel game, but actually planned for 4 additional games after the sequel. The first mobile version of the Sorcery! game sold well enough that Inkle also implemented the other 3.
It's all about daring to be different.
Nobody except Paradox creates high-complexity grand strategy games that appeal only to that small segment of the population that is capable of lifting a heavy cognitive load. You guys used to dare.
But there's nothing daring and there's nothing different about launching a mobile game based on microtransactions.
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