I'm being scammed

You simply did not understand the subscriptions being offered to you. Most apps have a yearly subscription and also a monthly subscription. They are offering the yearly subscription as a discount to the monthly subscription that is being offered. It is apparent that the yearly subscription of $99.99 is cheaper than paying $8.99/month for 12 months. Once you make your choice you are obligated to pay for it and you paid for a year. You have the choice to cancel the subscription or change it to a monthly plan, but that will only take affect after the current subscription is expired. When you cancel, you still get the service you paid for until that time, it just won't be renewed again.

That is how all subscriptions work, whether you sign up for a streaming service or from any company that offers a subscription for any period of time.

As for your review, developers cannot block you from providing a review. The only option a developer has is to report the review to Apple if it contains offensive language or other content that violates Apple's Terms of Use. You can view information about the review process here:

Ratings, reviews, and responses - App Store - Apple Developer

Don’t try other ai apps because they are made by cash grabbers, use the original ChatGPT instead, and cancel the subscription of that cash grab ai apps in the App Store.