Read their letter again. Last paragraph. Epic clearly wanted a special deal.The letter was written by Apple's attorneys, not Epic's. There is no mention of 15% or any revenue sharing negotiation in it.
When you say you know what was in the letter, it's very hard to believe you when you are making such fundamental factual errors.
I know you want to think that Epic is looking out for all developers, but the fact is Epic doesn’t care about anyone but Epic.
Epic thought they could extract a better deal than 30% without having anything to offer Apple in return. That’s just stupid. What makes Epic think they’re so special? Follow the rules that every other developer follows.
Apple was never going to agree to a 0% deal, with every developer opening their own store. As you know, Epic wouldn’t let anyone on their own platform for 0% revenue share, right?