Earlier quoted context omitted.
The developers aren’t happy. No one forces a Fortnite player to buy skins or emotes, Apple forces developers to pay the fee.
No one is forcing them to develop for iOS. I will bet you dollars to donuts developers are very happy about the money they make from iOS otherwise they wouldn't be there.
The market is.
You can not afford not to publish something on iOS, if iOS were a niche platform used only by 1% of users maybe, but it is a mainstream platform used by more than 40% of users in the US.