That is all well and good, but this case is not about the percentage. Based on Epic's statement in court and their various public rants, they would not be satisfied if Apple reduced the fees to 0%. They want a store of their own with all rights and benefits of direct access to the OS, hardware, and customers.
I have never published anything on the App Store so I have no personal stake in the percentage, but looking at the services provided I see nothing wrong with an expectation of a percentage from every IAP. And, 30% is really not that unreasonable. If you look at the 30% as simple the swipe transaction then 30% is a tad high. But you also get the ongoing developer support. More importantly you get the sales tax payments and filings in every jurisdiction your app sells. You get the financial accounting that goes with that, and the reporting you needful compliance assurance. That service and reporting shield alone is enough to justify. Even for someone the size of Epic - if they are ever investigated they can point to Apple. Yes, they are ultimately responsible if they don't check and correct a mistake, but they are shielded quite a bit. Much like having a CPA sign your tax form. You may still get audited but and taxes, interest, and penalties due due to the error will be greatly lessened by the fact a tax professional provided that filing effort.
I don't have a dog in this fight either. I'd be fine if everything stayed the same.
But there's obviously something going on. Epic taking Apple to court in the US... Spotify taking Apple to court in the EU... etc.
Apple's business practices are being scrutinized... though I'm not sure it will change anything.
I was just pointing out some of the complaints from some of the developers.
You're right... Apple does offer a lot of services for their 30% cut. I've shared this link quite a few times in these topics.
Sadly... some developers don't see it that way.
¯\_(ツ)_/¯