Purchase gone?
Response from developer
We are truly sorry for the inconvenience, as this has been a necessary change that is beyond our control. Hopefully you can give us another chance in a near future, as we have been doing improvements to the app. If so, don't forget to update the app in the Play Store and consider raising your rating. We would really appreciate it.
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Greed
Response from developer
We regret you haven't liked the app, so would you please tell us your opinion in more detail? This can help us a lot to improve, just like a better rating, which would be very much appreciated after updating the app in the store.