Epic is actively suing Google for using anti-competitive practices to force phone makers not to include 3rd-party app stores on their phones[0].
One example they bring up:
> Epic struck a deal with OnePlus to make Epic games available on its phones through an Epic Games app. The Epic Games app would have allowed users to seamlessly install and update Epic games, including Fortnite, without obstacles imposed by Google’s Android OS. But Google forced OnePlus to renege on the deal, citing Google’s “particular[] concern” about Epic having the ability to install and update mobile games while “bypassing the Google Play Store”.
If you want to show that sideloading doesn't make a difference for storefront fees, you should pick a company not currently being sued for antitrust to demonstrate it.
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> You have a choice of three consoles - why aren’t developers side loading there?
You can't sideload on a console, I don't know what you're getting at.
In regards to price fixing on consoles: you're right, the console situation is also bad. We effectively have only 3 major consoles, and a reasonably high barrier of entry into the space for similar reasons as mobile phones. Of course, the console space is better (in no small part because the PC market exists), and console manufacturers do compete more for developers than Apple and Google do. But it's not perfect, and as a result, you still see some issues around competition.
It took direct action from developers like Epic to even force the issue on cross-play, which is a decent sign that console manufactures really didn't feel like they needed to compete with each other in that area.
However, it is generally ill-advised to sue every single major games distributor at the same time, so it is perfectly reasonable for Epic to target what they see as the biggest problem-areas first.
The whataboutism doesn't really work here. Yes, console sideloading would probably be good for the market, it's just not as big and immediate of a problem as Apple is -- in part because more people own iPhones than an Xbox, in part because the barriers of entry to console competition are slightly lower, and in part because the PC games market provides somewhat of an escape hatch for console games, and that escape hatch isn't applicable to the mobile app market.
[0]: https://cdn.vox-cdn.com/uploads/chorus_asset/file/21759099/f...