What's good for the goose, etc.
As for whether 3% is reasonable, again we can look to Epic for evidence. Epic's own Steam competitor takes a 12% cut — and they admitted in court that it was a money-losing venture. That should stop and make you think. The Epic Games Store isn't even a complex ecosystem, it's just a glorified Windows app downloader and even then they couldn't make a profit at 12%.
Apple argues that their 15% fee for most (30% for the ultra-successful) pays for a lot more than just payment services. It pays for absorbing the cost of fraud. It pays for dealing with refunds. It pays for developing the APIs. It pays for employing an enormous team to perform some imperfect-but-useful oversight over the 1,800,000 apps in their store. It pays for a lot of things.
If you think Apple makes too much money, fine. That's a perfectly fine argument to make. That's a very different one to claiming that they're not entitled to make money. Or that the government should dictate prices at them.
And saying apples cut pays for more services is just hilarious. we are forced to use those services and forced to pay for them. Stripe does refunds and fraud detection. There are other app development platforms for API's like kotlin and flutter.
And you and I both know that apple's margins on the app store is a joke. Thats why they dont report it seperatly in their financials. Whether epic couldnt make it is their problem.
You argue that a 5% cut is reasonable and a 15% cut is not reasonable. You are haggling over the price.
It’s the market rate. Almost all retail stores online and offline charge 30%.