Apple and Google chiming together: "we're not a monopoly, we're a duopoly and that's perfectly legal"
Furthermore, Epic helped highlight a very important point about Android and iOS: They're not actually competitors. For an OEM building a phone, Android is the only option, it has a complete monopoly on mobile OSes with respect to the market of OEMs who might choose it.
I can choose from 4 different supermarkets within walking distance, and an additional 3 if you count online supermarkets that deliver to my area. That is not the case when it comes to choosing a mobile OS/app store.
Having more than one to choose from is still an option.
And I also know a few that still use and buy feature phones with their OEM only apps, with "by invitation only SDKs".
Which makes the choice bigger than two actually, when one looks at the actual market distribution, something that a judge will care about.
Apple has maybe 25% of the market. I say "maybe", because that percentage is decreasing every day. Especially globally. The reality of the situation is that Google is killing Apple in terms of marketshare. And Apple is eating Google in terms of profit. It's a situation that is a bit unprecedented.