That’s really not what’s going on though. They are trying to make it sound like it is. But they are arguing that iPhones in particular AND Fortnite itself is so important to daily life for the population at large that it would cause societal harm if the court did not stop apple from dehosting Fortnite on iOS.
Anti-trust courts can indeed put on hold actions taken by companies to give the court time to investigate what the full ramifications would be. Injunctions however are a different beast, they are a tool the court can use to stop something or stop someone from doing something without trial because allowing that to happen would cause “irreparable harm”. That term does not mean “lose a lot of money” in fact money is largely not considered relevant for something like this.