That, I believe a developer cannot do anything about it. The user can go and rate any app in store. App store will be handling all those things. We cannot just keep the good reviews and delete the bad ones. Reviews will be there.

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Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store