Update, 09/29/2025: Apple released iOS 26.0.1 on 09/29/2025, providing a resolution for the issue discussed in the below post.
Update, 09/18/2025: Apple has confirmed that they are aware of the issue and that it will be fixed in an upcoming software update. We will update this post as more information becomes available.
update 8 May
Apple has issued a clarification statement in which it says that its original announcement was misinterpreted and the changes to affiliate commission rates for App Store purchases aren’t as drastic as people have widely believed and reported. It now appears that only the commission rate for in-app purchases is being cut.