My guess is that 99% of the trials expire before the person buys the game. And that sequence probably works fine (and is tested). But you're right that it shouldn't be missed.
The thing is, I had finished the hour, but it didn't give me the prompt to buy the game. Instead it let me go back and play it for another hour. After that hour, I decided I didn't want to play the game one hour at a time so I decided to purchase it.
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