I get where the likes of Apple, Google, Steam, Playstation, Microsoft, Nintendo etc. are coming from. But I also see where Epic is coming from, 30% is a lot and some of the other App Store rules are very restrictive but its really not a straight forward Apple bad and Epic good, far from it.
You can't just look at them with the mindset that the App Store is a store and the fees they take should only cover things like card transactions. It isn't a market place like eBay or Amazon, its much more than that.
The store is a full publishing platform with things like full QA'ing of any submissions and updates, all billing and some customer support, development of the tools needed for developers to build software for the platform distributed for little to no cost, apps are hosted and distributed for free, discover ability engine, staff picks etc, 5+ years software support for devices running on the platform meaning they can take advantage of the latest API's.
Could Apple charge less for the above? Yes, absolutely, they make a lot of money off the App Store. That said developers make a lot more. The problem that a lot of developers have with the store are some of the other rules which are designed to protect Apple's position or their users. Are they some kind of evil dictator? No, don't be silly. If you have ever had the pleasure of publishing music or a book, 30% is nothing compared to what the publishes take there.
At the end of the day if you don't like the terms you are free not to publish or create your own platform. Epic certainly have the resources and the skills to do it. Epic isn't exactly going into this with the moral high ground either. To start, this is a company that has made billions targeting kids with loot boxes and micro transactions. They are attempting to mobilise their user base (mainly kids) to create a trial by social media when frankly they don't understand what is even going on. The latter I take particular exception to, because this isn't about Apple being some kind of evil company, its all business and this whole saga was clearly well thought out and a long time in the making. If they genuinely thought they had an anti-trust case against Apple and Google, they should have just taken them to court. All this drama and toxicity is just a side show and is completely unnecessary. If they also genuinely think 30% is extortion then I'd also like to see them file against Sony, Nintendo and Microsoft at the same time.