For folks who don't have time to read a 90 page document, the case rests on specific claims, not just the general claim that iPhone is a monopoly because it's so big. Here are those claims:

1. "Super Apps"
Apple has restrictions on what they allow on the App Store as far as "Super Apps", which are apps that might offer a wide variety of different services (specifically, an app which has several "mini programs" within it, like apps within an app). In China, WeChat does many different things, for example, from messaging to payments. This complaint alleges that Apple makes it difficult or impossible to offer this kind of app on their platform. Apple itself offers a "super app" of course, which is the Apple ecosystem of apps.

2. Cloud streaming apps
Similar to "super apps", the document alleges that Apple restricts apps which might stream different apps directly to the phone (like video games). It seems there are several roadblocks that Apple has added that make these kinds of apps difficult to release and promote - and of course, Apple offers their own gaming subscription service called Apple Arcade which might be threatened by such a service.

3. Messaging interoperability
Probably most people are familiar with this already, how messages between (for example) iOS and Android devices do not share the same feature-set.

4. Smartwatches
Other smart watches than the Apple Watch exist, but the document alleges that Apple restricts the functionality that these devices have access to so that they are less useful than the Apple Watch. Also, the Apple Watch itself does not offer compatibility with Android.

5. Digital wallets
It is claimed that Apple restricts the APIs available so that only Apple Pay can implement "tap to pay" on iOS. In addition to lock-in, note that Apple also collects fees from banks for using Apple Pay, so they get direct financial benefit in addition to the more nebulous benefit of enhancing the Apple platform.

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