Ratings and Reviews are potentially benefiting app Developers in the sense of getting better understanding of how their applications are doing when it comes to user's experience.

Additionally, if you're interested in purchasing an app on the Apple app store, you can check the ratings & reviews section to know whether the app worth your money.

Therefore, you can learn how to rate and review App on the Apple App Store here if you don't know how to go about it: https://temmy-samuel.medium.com/how-to-rate-applications-on-apple-app-store-3270ae9f29e8