People who are rooting for Apple on this: do you realize that if Epic loses you all get to keep paying Apple up to 30% tax every time you buy something from their App Store (even if it has nothing to do with Fortnite)? You're basically happy to pay more money to the company who has made $15 billion in revenue from the App Store alone last year. Do you actually believe it costs them $15 billion a year to run an online store?!
The fact that so many companies are charging the 30% tax while there's definitely a lot of backlash from developers (big and small) smells like some sort of price fixing to me. Maybe they're thinking: "If Apple are charging 30% and people are willing to pay why should we charge less?"
If Apple loses, do you realize that it means that if you or anyone else who happens to develop a product that becomes popular you may have to give up the right to control the features you add to that product? And take a read through this forum to see all the potential downsides for users if Epic were to succeed. Many of us just don't want that experience. Absolute price is not the only value to the iOS experience for many users and many developers.