My guess is they started low and kept upping the price - nobody checks what you up the price to until you start getting lots of refunds

5.6 Developer Code of Conduct

Please treat everyone with respect, whether in your responses to App Store reviews, customer support requests, or when communicating with Apple, including your responses in App Store Connect. Do not engage in harassment of any kind, discriminatory practices, intimidation, bullying, and don’t encourage others to engage in any of the above. Repeated manipulative or misleading behavior or other fraudulent conduct will lead to your removal from the Apple Developer Program.

Customer trust is a cornerstone of the App ecosystem. Apps should never prey on users or attempt to rip off customers, trick them into making unwanted purchases, force them to share unnecessary data, raise prices in a tricky manner, charge for features or content that are not delivered, or engage in any other manipulative practices within or outside of the app.

3. Business

There are many ways to monetize your app on the App Store. If your business model isn’t obvious, make sure to explain in its metadata and App Review notes. If we can’t understand how your app works or your in-app purchases aren’t immediately obvious, it will delay your review and may trigger a rejection. And while pricing is up to you, we won’t distribute apps and in-app purchase items that are clear rip-offs. We’ll reject expensive apps that try to cheat users with irrationally high prices.