YSK Apple charges 30% extra for apps and subscriptions bought through the App Store
Why YSK: You can avoid the extra fees by purchasing the content directly from the developer on a browser.
I’ve been paying over $17/mo for the last year for YouTube premium, by paying for the subscription through the YouTube app. The app wasn’t working the other day, so I went to the website to pay for my subscription. It was then that I noticed the actual subscription is only a flat $11.99/mo.
https://appleinsider.com/articles/23/01/08/the-cost-of-doing-business-apples-app-store-fees-explained