I'm curious: how much revenue are they making off others' games written on Unreal and appearing on iOS? This isn't some coy "oh, well Epic takes a cut, too!" because IIRC their cut is reasonable. But I do think one could consider Unreal licensing for iOS games part of their iOS revenue.

Edit: also recall that Apple can't currently prevent others using Unreal to make games for iOS: https://arstechnica.com/gaming/2020/08/judge-issues-restrain...