While you're correct, it's worth noting that this only happened because the judge in the Epic lawsuit ordered an injunction forcing Apple to allow it.
Apple then "maliciously complied", allowing it while demanding a 27% fee on any web-based payments, which was found to be a violation of the injunction.
> For U.S. fans, there’s still a way to avoid Apple’s fee. When signing up in the iOS app, they can choose web checkout instead of Apple’s in-app purchase system. Apple’s rules require that any paid content shown in the iOS app is also available to purchase through Apple’s in-app system.
