It doesn't, although Epic simultaneously sued Apple over this in a separate suit. Their arguments against Google and Apple were different, and in the Apple case the judge sided with Apple on practically every count.

https://en.wikipedia.org/wiki/Epic_Games_v._Apple

Notably, the one aspect that was not ruled in Apple's favor was their "anti-steering" policy, which prohibited developers from informing users about different app stores or payment methods within an iOS app. The crux of the ruling boiled down to Apple not having a monopoly over the smartphone market or mobile gaming in general since people can "just" go out and buy an Android device and do business with Google instead (while avoiding mention that Google has near identical policies re: the Play store and takes the same cut of a developer's revenue).

Needless to say, pretty much every sane person on Earth plus a pretty wide spread of other tech companies can clearly see that the ruling in the Epic v. Apple case was complete bullshit, especially in light of this ruling in the Google one.