Hi, can I force a 5-star review to allow users to use the app's features? Is this a violation of policy?
What an unfair practice !
This would be an absolute violation of policy. You even risk to get your app removed and account cancelled.
If you attempt to cheat the system (for example, by trying to trick the review process, steal user data, copy another developer’s work, manipulate ratings or App Store discovery) your apps will be removed from the store and you will be expelled from the Apple Developer Program.
